At a factory in France belonging to the aerospace corporation Airbus a 6,200 kg spacecraft has completed its assembly and testing and is now being packed up for shipment to its launch facility. The space probe is the European Space Agency’s (ESA) Jupiter Icy Moons Explorer or JUICE, which is scheduled to liftoff aboard an Ariane 5 rocket from the ESA’s Kourou launch complex in French Guiana this April.
The Jupiter Icy Moons Explorer (JUICE) spacecraft and the worlds it will explore. (Credit: NASA)
The JUICE spaceprobe is Europe’s first robotic mission to the outer solar system. Indeed it will be the first non-NASA spacecraft to go beyond the orbit of Mars. Because of the immense distances and energy needed to reach the Sun’s outer worlds JUICE’s journey to Jupiter will take eight years and require several gravity boosting flybys of both Venus and the Earth.
The Pioneer 10 space probe was the first man made object to reach the outer Solar System, and it then continued on the leave the Solar System. So far only the United States has succeeded in reaching as far as Jupiter. (Credit: NASA)
The mission of JUICE is to make multiple flybys of three of Jupiter’s big moons, Europa, Ganymede and Callisto, all of which are known to be covered by enormous sheets of ice beneath which it is thought there could be oceans of liquid water. Water that could be the habitat of living creatures.
Of Jupiter’s four big ‘Galilean’ moons the three on the right are covered with ice and are the targets of the JUICE space probe. Io, on the left, is the exact opposite being very hot and covered with volcanoes! (Credit: BIRA-IASB)
To carry out its mission JUICE carries 10 instruments including a Laser altimeter for making a 3D maps of the surfaces of the moons and an ice penetrating radar to discover if there really are oceans beneath those icy surfaces. And as the space probe travels back and forth between Jupiter’s moons it will use magnetometers and radiation detectors to study the complex magnet fields generated by the largest planet in the solar system and how that field effects, and is effected by its moons. Power for all these instruments is provided by a huge 100 square meter solar panel. Such a large array is needed because Jupiter is so far from the Sun that the sunlight out there only 1/25th as powerful as it is here on Earth.
The JUICE space probe undergoing testing at Airbus. (Credit: The Guardian)
After a period of three and a half years studying the three moons JUICE will enter into orbit around Ganymede, the largest moon in the solar system, for further study. Eventually the spacecraft’s orbit will decay and JUICE will crash onto the surface of Ganymede.
Bigger than the Planet Mercury Ganymede is the largest moon in the Solar System. Beneath that icy coating astronomers think there is a liquid ocean containing more water than there is here on Earth. And could there be life as well? (Credit: Earth Sky)
As it carries out it’s mission of discovery JUICE will not be alone. Scheduled for launch in October of 2024 NASA’s Europa Clipper spacecraft will actually reach its target of the moon Europa a month or two before JUICE arrives at Jupiter. Since the Europa Clipper is still undergoing its final testing and isn’t scheduled for launch until late next year I’ll hold off on a lengthily description of that space probe.
NASA’s Europa Clipper space probe will leave Earth after the ESA’s JUICE but will arrive at its destination of Europa first! (Credit: NASA)
What I will do however is take a few minutes to discuss why both the ESA and NASA are so interested in Jupiter’s icy moons and it all has to do with the search for liquid water elsewhere in the solar system. You see, here on Earth wherever you can find liquid water there you will find life and perhaps the simplest definition for life is complex chemicals dissolved in packets of water. The space agencies therefore feel that their best chance for finding life elsewhere in our solar system is to find liquid water.
As seen in this image from Hubble, Europa is completely covered in ice but scientists are certain that there is an ocean beneath that ice. In the past few decades NASA has followed a plan of ‘Follow the Water’ in its search for life off the Earth. (Credit: Hubble Space Telescope)
Now Jupiter’s icy moons certainly have water in the form of ice, we can see that in pictures taken as far back as the Voyager probes. At that distance from the Sun however the question is, where’s the heat coming from that’s needed to create the theorized oceans beneath the ice.
The same forces that cause the Volcanoes on Io should be generating hot ‘thermal vents’ on Europa. Given both water and energy the possibility of life is very good! (Credit: MarineBio.net)
The answer lies in the tidal forces generated by massive Jupiter and it’s four big moons. As each moon orbits around Jupiter it’s pulled and squeezed not only by Jupiter’s strong gravity but by the three other moons as well. That pulling and squeezing causes friction deep inside each moon and fiction generates heat, lots of it.
Here on Earth the Tides cause the oceans to rise and fall twice every day. This actually does generate a tiny amount of heat. The Tidal forces, and so the heat, generated by enormous Jupiter and its four big moons are much larger. (Credit: Lumen Learning)
We know that is true from our observations of Jupiter’s innermost moon Io, which is the most volcanically active body in the solar system. The heat generated by tidal forces inside Io must be tremendous and so we estimate that the heat inside Europa and maybe Ganymede should be enough to have melted some of their ice, producing oceans that could easily contain more water than all the oceans here on Earth. And once again, where there’s water, there’s a good chance for life.
The moon closest to Jupiter, Io feels the full force of Jupiter’s tides making it the most volcanic body in the Solar System. (Credit: NASA)
We now know that Mars once had oceans, and if JUICE and Europa Clipper do find oceans on Jupiter’s moons how long will it be before we do finally find life out there?
From time to time we all stop for a moment to consider the ‘what ifs’ in our lives. You know what I mean; we wonder how our lives would be different if we’d made different choices, or if we could go back and change something that had happened in our past. Author Blake Crouch goes a little further, he wonders how the Universe would react if people could actually make those kinds of changes and writes Science Fiction novels where he examines the consequences of such technologies.
Many Science Fiction novels are actually meant to provide a mirror on human society. In his ‘The War of the Worlds’ H. G. Wells was actually commenting on Europe’s violent colonizing of the rest of the world. (Credit: Wikipedia)
Back in my post of 2 September 2022 I reviewed Crouch’s novel ‘Recursion’ where Time Travel allows people to go back into their pasts and change the biggest moment of their lives. In ‘Dark Matter’ he uses the idea of the Multiverse to allow his characters to go to other universes where they have made different choices in their lives.
In ‘Recursion’ Blake Crouch uses Time Travel to comment on how people dream about changing the mistakes they’d made in their lives. (Credit: Amazon)
Jason Dessen is a professor of physics at a small mid-western university, a happily married man with a wife and son. It could have been different, he could have accomplished big things but he got his girlfriend pregnant and when the baby was born the child had a lot of medical problems so Jason gave up his chance at scientific immortality to be a father and husband. At the same time his wife Daniela gives up her career as an artist to be a wife and mother.
Author Blake Crouch and the cover art for his novel ‘Dark Matter’. (Credit: Aralingua)
Then one night as he is walking home Jason is kidnapped by a man in a mask and taken to an abandoned power station outside Chicago. There his assailant forces him to exchange all their clothes, takes his wedding ring and then injects him with drugs that knock him out. When Jason wakes up he is in another Universe, a world where he became a top scientist, in charge of a billion dollar project to open up the doors to the Multiverse, a world where his entire life is taken up by his work with no personal life at all.
Is there an infinite number of different Universes? The idea actually makes sense according to several of the latest models of how our Universe works. (Credit: Universe Today)
In his attempts to get back to his Universe, where his assailant has now taken his place, Jason visits many different Chicagos, different Universes, each of which differs to some degree, great or small from the Chicago that is Jason’s. In this part of ‘Dark Matter’ Crouch gives a wonderful glimpse into just what the reality of a Multiverse, the infinity of Universes each just a tiny bit different from all the others, could mean. Then, when somehow Jason does find his way back to his own Universe, things really get weird, but since I don’t want to spoil things I’ll stop there.
The windy city of Chicago is the setting for ‘Dark Matter’ or to more accurate several versions of Chicago are the settings! (Credit: Choose Chicago)
As he did in ‘Recursion’ Blake Crouch takes us on a wild ride that builds to a crescendo, I didn’t see the ending coming at all. In ‘Recursion’ Crouch just asked us to accept just one thing, his way of time travel. Once we allow that everything else in the novel follows quite logically. Same thing in ‘Dark Matter’ Crouch only asks that we agree to Jason’s method of opening up the Multiverse, then everything else makes sense no matter how weird it gets.
In his novels Blake Crouch really only asks us to accept one, very strange idea. The rest of the story works pretty logically from there. That makes ‘Suspension of Disbelief’ much easier. (Credit: Go Teen Writer)
Except at one point, and it’s a big ‘hey wait a minute’. Jason spends more than a third of the novel trying to get back to his Universe amongst an infinity of Universes. His assailant however had no difficulty taking Jason to his Universe, dumping him there and then getting back to Jason’s Universe to take his place!
Aside from that ‘Dark Matter’ is a wild ride, both thought provoking and exciting, I absolutely look forward to reading more of Blake Crouch’s works, but I have a little worry. Both ‘Dark Matter’ and ‘Recursion’ use science fiction to examine the ‘What ifs’ in our lives. I’m hoping that Blake Crouch doesn’t get into a rut. I hope his next novel is an alien contact story or something similar.
We really do need to get on with our lives and not let the ‘what ifs’ destroy whatever chance for happiness we still have. (Credit: Icy Tales)
And if it is you’ll see it reviewed here at Science and Science Fiction.
There can be no question that the rise and subsequent fall of the Roman Empire is one of the most important stories in all of history. For a little village in the middle of the Italian peninsula to gain control of the entire Mediterranean and all the lands around it is a testament to the military technology and organization of the Roman people.
Edward Gibbon’s ‘The Decline and Fall of the Roman Empire’ is considered one of the most influential books of all time. (Credit: Easton Press)
There’s no doubt that the Romans were brutal, conquering other nations one by one then collaborating with some of the conquered upper class while enslaving pretty much everyone else. Rome’s willingness to rule through local leaders, backed up by the iron fist of the legions whenever the lower classes got out of hand led to an empire that lasted more than 600 years.
After defeating the rebel slave army of Spartacus the Romans Crucified every prisoner they took in a line the stretched from Mount Vesuvius to the gates of Rome itself ! (Credit: Zainab’s Lounge)
But the Romans were more than just soldiers and politicians, they also possessed the accumulated artistic and engineering skills of the civilizations that came before them all the way back to Babylon. With those skills they built beautiful cities throughout their empire and decorated them with monuments and statues, frescos and jewelry the like of which the world had never seen. In this post I shall be discussing two recently discovered archaeological sites that remind us not only of how skilled the ancient Roman artists were but of how hard the barbarians who finally defeated Rome sought to emulate and preserve Roman art.
With all of their skill Roman art could be quite beautiful, yet at the same time still a bit brutal! This is their idealized version of the first emperor Augustus. (Credit: Smarthistory)
The first story comes from the small Italian town of San Casiano dei Bagni just a short drive of 160km north of Rome and dates to a time around 200 BCE. Researchers had been involved in the excavation of an ancient Roman bath, itself an important find when they began to unearth a series of twenty-three beautiful and exquisitely preserved bronze statues from the mud beneath the bath.
One of the statues from San Casiano dei Bagni after being cleaned, the quality of the workmanship is obvious. This must have been a very valuable piece even back in Roman times, so why was it deliberately buried in the mud around a Roman bath? (Credit: WWNY)
The statues are believed to be of some of the Greco-Roman gods like Apollo and Hygieia, yes the ancient Roman goddess of Hygiene. The archaeologists from the University for Foreigners in Siena who are carrying out the excavations think that the statues represent votive offerings to the gods in the hopes of receiving good fortune in return. The statues were deliberately sunk in the waters near the bath in much the same way, and for the same reason we still throw pennies in a wishing well. In fact along with the statues the archaeologists have uncovered over 6,000 bronze, sliver and gold coins dating to between the second century BCE and the first century CE so the site must have remained a ritual center for centuries. As for the statues themselves they are now undergoing a thorough cleaning in a labouratory at nearby Grosseto before they are to be put on displayed in a new museum dedicated to Roman artifacts in San Casciano.
Another staute (a Roman God?) as it was found in the mud. The mud actually turned out to be a excellent method for preserving the statues. (Credit: The Guardian)
In addition to the Statues the archaeologists have unearthed thousands of Roman Coins. It seems the Romans used San Casiano dei Bagni in the same way that we use ‘Wishing Wells’. Only they were a lot more serious about paying to get their wishes! (Credit: Reddit)
Such was the power and prestige of Rome that even the barbarians who finally conquered the western half of the empire continued to value Roman art and artifacts, even to the extent of incorporating Roman art into their own whenever they could. An example of this reuse of Roman art long after the fall of Rome was discovered recently at a dig in Northamptonshire.
Archaeologists at the Northamptonshire site doing what Archaeologists love to do, dig. (Credit: North
The site is an undisturbed burial of a high class Anglo-Saxon woman that has been dated to about 1,300 years ago. The grave contained a number of interesting objects including two decorated pots and a copper plate but the most spectacular find was a chain necklace composed of thirty pendants, all very rare and valuable.
Artists reconstruction of the woman’s burial in Northamptonshire. With all of the grave goods that were unearthed this woman must have been an important member of her community. (Credit: The Conversation)
The objects on the necklace varied considerably, some were made of gold, others of semi-precious stones while some were made from Roman coins, some 300 years after the Romans abandoned Britain. The use of Roman coins as pieces in an Anglo-Saxon necklace speaks to how powerful an influence Rome was, even centuries after its fall.
Some of the Jewelry discovered at the Northhamptonshire burial site. The coins are actual Roman coins and the whole collection has the feel of an attempt to copy ancient Roman style. (Credit: CNN)
The most beautiful pendant, and almost certainly the centerpiece of the necklace is a large square piece made of red garnets set in gold that has a basic cross shape. The inclusion of a very valuable necklace with a cross motif centerpiece in the grave has led researchers to speculate that the deceased was a high born lady, and perhaps an early Anglo-Saxon convert to Christianity. Unfortunately the only organic remains were a few fragments of tooth enamel so any details of the person buried have probably been lost forever. As with the Roman statues the finds from Northhamptonshire are currently undergoing cleaning and conservation efforts at the Museum of London Archaeology (Mola) and will go on display sometime in the future.
A human face cast in silver is one of the more intriguing finds from the Northamptonshire burial. Archaeologists have found evidence that the woman buried was a Christian so could this have been meant to be the face of Jesus? (Credit:The Past)
Studying the art of an ancient people is one of the most powerful tools archaeologists have in trying to understand those people. The art of ancient Rome left its mark on many of the cultures that came after it.
There are two kinds of paleontologists in the world, field explorers who discover sites where new and exciting fossils are found, and labouratory analysts who use the fossils that are unearthed to understand the big picture of life in the past. Today’s post is about two sites where new discoveries are being made along with a new study, based on evidence from fossil sites around the world, that tackles the question of why some creatures, such as our mammalian ancestors, survived the asteroid strike 66 million years ago killed all the dinosaurs. As usual I’ll begin with the oldest story in geological time and go forward from there.
At fossil sites around the world paleontologists unearth the data, the fossils that is, they need to study past life on Earth. But at the same time a lot of work is needed to understand what that data is telling us. (Credit: Phys.org)
Paleontologists have categorized the history of life here on Earth into a large number of ‘periods’ some of which are better known that the others. The Cambrian period is known for being the first period with large numbers of species who possessed ‘hard parts ‘ that can fossilize. The Devonian period is known as the ‘age of fishes’ where vertebrate animals with bony skeletons began to dominate the oceans, and by the end of the period the land. The Jurassic and Cretaceous periods are both known for the many familiar dinosaur species that lived during them.
The time that multi-cellular life has existed is known as the Phanerozoic Eon, which is then subdivided into eras and periods. (Credit: Digital Atlas of Ancient Life)
The Ordovician period isn’t that well known. Coming right after the Cambrian the animals that lived about 470 million years ago (mya) aren’t really that much different from their Cambrian ancestors. I have quite a few Ordovician specimens in my collection and they are mostly bivalved brachiopods along with a few trilobites and some other invertebrates like corals.
The animals of the Ordovician period seem strange and primitive to us because the story of life was just getting started. (Credit: Natural History Museum)
Now a newly discovered fossil site in Morocco may help to increase interest in the Ordovician period by highlighting the diversity of large arthropods that existed 470 mya. The site is a part of the Fezouata shale that outcrops from the Atlas Mountains and which has recently been designated as one of the 100 most important geological sites in the world.
Some of the fossils discovered in the Fezouata shale. Several of these creatures seem to be related to the earlier creatures discovered in the famous Burgess shale from the Cambrian period. (Credit: Nature)
The Fezouata shale as a whole is well known for the exquisite condition of its specimens, with the soft parts of the animals often as well preserved as their hard shells. However most of the specimens in the Fezouata consist of creatures that lived and crawled on the shallow sea floor. Until recently very few specimens of free swimming or nektonic animals had been found. The new site, which is being excavated by paleontologists from the University of Lausanne and the University of Lyon, does precisely that, providing specimens of dozens of new species of arthropod that swam freely, some of which are as much as 2m in size.
The Fezouata shale location with the Atlas mountains in the distance. Ever notice how the most inhospitable regions always seem to be fossil hot spots. (Credit: Lyell Collection)
It is thought that the new site may be different from the already known Fezouata sites because the carcasses of larger animals where transported to deeper water by underwater landslides. Regardless the new site opens yet another window into a relatively unknown time in the history of life on Earth.
The Fezouata fossils are helping to fill in a gap in our knowledge of the earliest multi-cellular species of life. (Credit: Center for Geosphere Dynamics)
Another such window is the Berlin Ichthyosaur State Park in the state of Nevada. Unlike the Fezouata site in Morocco, which contains specimens of dozens of different species, the Berlin site is very much dominated by specimens of the bus sized ichthyosaur species Shonisaurus popularis.
Berlin Ichthyosaur State Park in Nevada is open to the public and is certainly a fun place for the whole family! (Credit: Travel Nevada)
Living during the age of dinosaurs, ichthyosaurs were aquatic reptiles that seem to have filled the same ecological niche as dolphins, porpoises and whales do in the oceans today. In a recent issue of Current Biology a team of researchers from the University of Utah, the Smithsonian Institute, Vanderbilt University, The University of Nevada at Reno, the University of Texas at Austin, along with Vrije Universiteit in Brussels and Oxford University in the UK, have published a new paper that suggests that Shonisaurus popularis may have resembled whales in more ways than just size and shape.
As large as many of today’s whales, Shonisaurus popularis was the giant of the oceans during the age of the dinosaurs. (Credit: Prehistoric Wildlife)
In our modern seas several species of whales are known to migrate thousands of miles in order to give birth in relatively predator free, protected areas of the oceans. The researchers think that the Berlin site may have served the same function for the ichthyosaurs who ruled the seas back when dinosaurs ruled the land.
Many species of Whale migrate over thousands of kilometers in the oceans following their food sources as well as seeking safe areas in which to give birth to their young. (Credit: Daily Mail)
As I said above the fossils at the Berlin Ichthyosaur park are almost exclusively Shonisaurus popularis, there’s little sign of anything that the ichthyosaurs could feed upon, or feed upon them. The fossils also consist primarily of fully grown adults and newborns, no juveniles.
Baby’s first picture. A newborn Sperm Whale cafe. Like humans whales seem to prefer to keep older children outside of the nursery, and out of the way when a delivery is happening. (Credit: Youtube)
For a long time it was thought that the Berlin site may represent an ancient beaching, where a group of Shonisaurus popularis got confused and swam up onto a beach that they could not escape from, much as dolphins and porpoises do today. However a chemical study of the rock around the fossils shows no sign of any toxin that could have led to such a beaching. And a 3D analysis of the positions of the fossils indicates that the animals did not all die at the same time but rather over hundreds, if not thousands of years. In other words, occasional deaths happening at a place where large numbers of the animals gathered on a yearly basis.
A mass beaching of Whales in Tasmania. Recent evidence indicate that this is not what happened to the Ichthyosaurs at Berlin State Park. (Credit: BBC)
So did ichthyosaurs, the whales of the age of dinosaurs also migrate across the oceans of their day to aquatic nurseries where they could give birth in relative safety? The Berlin site certainly suggests that they did and if so that would show that, when living creatures face the same problem they often evolve the same solution, even when separated by millions of years.
Finally another large scale study by paleontologists at the University of Oulu in Finland, the Universities of Leon and Vigo in Spain along with the University of Edinburgh in Scotland have tackled the question of why it was that the dinosaurs went extinct while some species of mammals, birds along with crocodiles and turtles managed to survive. The team of paleontologists carried out their investigation using the data obtained from hundred of different papers on environmental conditions at the end of the cretaceous period published over the last decades.
The day the Dinosaurs died. One of the most catastrophic events in the history of life. But where the dinosaurs already on the road to extinction or were they doing quite well just before the asteroid struck? That’s a question paleontologists have been wondered for decades. (Credit: Tech Explorist)
According to the study the answer may be, paradoxically that the dinosaurs were too dominate, too well fitted to the environment as it existed just before the asteroid struck. By adapting so completely to their world the dinosaurs had pushed the other creatures to the margins where they had to do whatever they could to survive.
Sometimes a species can be too well adapted to its environment, like these polar bears. With global warming melting the polar ice these bears are facing extinction. (Credit: Encyclopedia Britannica)
That may have served the dinosaurs well before the asteroid struck, but in the environmental upheaval that followed they couldn’t adapt in time, while the small little rat like mammals managed to get by on whatever they could find. In other words the dinosaurs were so good at what they did that they couldn’t learn to do anything else while the mammals and birds had already learned to do many things making them better able to adapt to the new conditions.
Other species are generalists, doing whatever is needed to survive. Did the Dinosaurs die out while mammals lived because they were so well adapted to the world before the asteroid while mammals knew how to get by on whatever scraps the dinosaurs left them? (Credit: Snapshot Wisconsin)
A lesson perhaps for today with our, human induced, rapidly changing environment?
