Who Owns Space?

NASA - Big and Bright 'Perigee Syzygy' Moon Occurs Saturday
Will there soon be mining settlements dotting this surface? (Source)

One of my foremost interests in life is politics, and whenever we’re engaged in astronomy, I can’t help but to view it through that lens. As such, one question has been nagging me – how is ownership and control of certain places defined in space?

One of the foundational pieces of legislation on the matter is the 1967 Outer Space Treaty, which most of the world’s space faring nations are party to. The most important aspect of this treaty, for our purposes, is that it explicitly states that no government can lay claim to ownership of any “celestial object.” Nor can any military activity take place on these objects. As we have approached the modern day however, many issues have arrived with the fairly simplistic treaty. If one can’t “own” or “control” an object in space, what are they allowed to do? Is mining okay? According to a 2015 US law, ensuring that private companies can keep material resources from celestial objects, yes! Indeed, President Trump said that the US will begin mining the Moon for materials as part of its settlement. China has made similar statements. Materials are allowed to have ownership claimed then. So in this simplistic set of rules, ownership of material is just based on who gets what first. Perhaps this will eventually be the de-facto way of “owning” places on the Moon or elsewhere in – it belongs to whoever gets there and sets up first.

But this is hardly a sustainable policy. It might work at first, when contention for places is low because of the wide array of possible locations and the few competitors, but eventually, legislation beyond the ’67 Treaty will become unavoidable. What happens when two countries or companies, expanding their already established territory, try to set up on the same asteroid or piece of lunar land? Moreover, can companies claim ownership of territory in space, since the treaty only precludes governments from claiming sovereignty? Might this lead to a sort of anarcho-capitalist system in which profit reigns? Elon Musk, after all, is set to be one of the pioneers of Mars’ colonization, and his company is private. The answer, right now, is that no one really knows. The framework set in place by the ’67 treaty is too vague and outdated. As we progress forward, true means of legal arbitration and ownership in space will have to be put forward – or bad things could happen.

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Shepherd Moons

Saturn is known for its rings. For years, astronomers wondered what they were. Now we know that the rings of Saturn are made up of lots of icy particles ranging from the size of a grain of sand to a boulder. These particles comprise many different individual rings. The rings are flat, and appear to be in “sheets” around the planet. In between some rings are gaps that are caused by particles that are a bit larger than others––these are known as gap moons. Gap moons are small moons that gravitationally force the particles near them in a certain direction. By doing this, they create a gap in which only the moon resides.

One type of gap moon is a shepherd moon. Shepherd moons are moons that are on either side of a ring, forcing particles inward toward that ring and outward away from themselves. They guide the particles into line, and the ring in between them becomes very narrow.

I like shepherd moons because they remind me of Jesus. There are many verses in the Bible that talk about the Lord as our Shepherd (Psalm 23, Ezekiel 34:31 Luke 12:32, etc.). I like this picture of God as Shepherd because it reflects His gentleness. A shepherd’s job is to guide and protect his flock. He does not use brutality, but instead uses his shepherd’s staff to nudge and tap the sheep to walk in the way that the shepherd knows is best. It is not his intention to harm the sheep or to lead it astray. In the same way, Jesus plays this role in our lives, gently nudging us along the path that He set out for us long before we were born. He is wise, and He cares about each individual that He created.

The shepherd moons, guiding particles this way and that using their gravity, offer a representation of this truth in a way that is very comforting to me! I am thankful for all of the ways, big and small, that I can see God in His creation!

What intrigues or interests you about Saturn’s rings? Did you know about the gap moons or shepherd moons? Do you find the rings to be beautiful? Let me know in the comments! As always, thank you so much for reading!

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Blog 5: Is there life on Europa?

The moon Europa orbits Jupiter alongside three other unique satellites described as “Jupiter’s Galilean moons”; these moons although similar in size to our moon (especially Io and Europa) display geological activity very different from what is observed on our own. Europa in particular, after telescope observation and satellite missions such as Voyager 1 and 2, was determined to have a surface composition of mostly water ice with very few examples of cratering. Suggesting that through some process Europa’s surface is comparably young within astronomical timeframes. Through this imaging and modeling, it is believed that underneath Europa’s icy outer crust is a vast ocean of water possibly suitable for life.

Life stems from three essential ingredients: water, chemistry, and energy. Each needs to be present to create life as we know it. It is possible that within Jupiter’s moon Europa all three of these ingredients exist. Water, the first building block of life, is essential because as NASA describes, “It dissolves nutrients for organisms to eat, transports important chemicals within living cells, and allows those cells to get rid of waste”. This source of water is believed to be the vast salty ocean beneath Europa’s initial ice water surface. Evidence supporting this belief comes from observations by the Hubble Telescope, as when backlit by Jupiter plums of water discharged from fractures in Europa’s south pole are depicted. This along with observation of surface activity suggest that Europa has a warmer liquid interior. The next input for a biologically active planet is chemistry. Specifically the presences of carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur, all common elements believed to be present during the formation of the satellite. Lastly, energy is need for life to survive. However, because Europa is so far from the sun its life cannot be supported through photosynthesis. Instead, the radiation received from Jupiter could provide the needed energy for life below Europa’s surface. As the radiation hits Europa’s atmosphere it strips apart water molecules leaving behind oxygen. A reactive element that could be used in a process to produce energy.

Because of this possibility of life, NASA has even announced a new mission to Europa named “Europa Clipper“, that will specifically determine if Europa could contain conditions suitable for life.

Image of Europa from NASA
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Halley in History

Tapestry depicting Halley’s Comet and a worried King Harold II Source

Halley’s comet is one thought to have been noted in history millennia before it was ever realized that it was the same comet passing Earth every 75 years. The first official record of the comet’s passing was 239 BCE by Chinese astronomers, but it’s thought that it might have been recorded by the Ancient Greeks in 466 BCE. Throughout history, it was thought of as a signal of impending downfall from the likes of Roman Emperors, Holy Roman Emperors and even Atilla the Hun. By far its most famous passing of Halley’s comet was in 1066 during William the Conqueror’s Norman conquest of Britain. People at the time saw it as a bad sign for King Harold II, which emboldened William and the Normans, ending in their success. This might be one of the most important events in Western history, and lead to a blending of groups, leading to everything from the Anglo-Saxon ethnic group to the myriad of French in the English language. It is super interesting to see how this one comet, which passes whether there is a war going on or not, has affected so much of our history, while the whole time it is just some rock orbiting the Sun independent of any Earthly happenings. Its wild to think about how much of human history is a product of our misinterpretation of unrelated events, with the passing of Halley’s Comet being one of the most prevalent.

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Ultima Thule: The Space Peanut

New Horizons image of Ultima Thule originally taken by NASA

When the New Horizon spacecraft set out into our solar system in January of 2006, we felt like we had a pretty good idea of all the possible things we could find in our solar system. While we may find some surprises, we figured everything would be mostly roundish, and composed of some rocky/icy surface and maybe an atmosphere. However, when we first visited Ultima Thule in 2019, those notions were blown out of the water. Ultima Thule was the first known celestial body that was a fusion of two different planetesimal bodies. With a total length of about 24 miles long, Ultima Thule isn’t an especially large body, and you could drive from one end to another in under an hour if you had a car. Displaying very few craters, Ultima Thule appears to be a very young surface, implying it has little to no geological activity. This would make sense given it’s small size, which would make it difficult to reach internal pressures high enough to heat its interior. While Ultima Thule doesn’t seem to be especially groundbreaking in terms of it’s composition or atmosphere, it does come as a stark reminder that just when we’ve reached a point where we think we can expect everything we might find out in the cosmos, it finds a way to prove us wrong yet again. Given what we’ve seen so far, I am excited to see what other celestial bodies may exist just beyond our sight.

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Living on Titan

View of Titan

Titan is the largest moon of Saturn. It is an icy world with an atmosphere thicker and denser than Earth’s (1.5 times the atmospheric pressure of Earth) that has clouds of smog that coat it in a large, cloudy golden haze. So how could scientists think it could be a habitable substitute for Earth for humans?

The answer is because of Titan being much better suited for human beings to survive than any other world, even Mars. Because of it being made of water ice, there is a chance for oxygen extraction by humans, helping with survival. In addition to this, Titan has a high probability of an ocean below the surface, contributing to If we were to attempt to live on Titan, we would not be able to breathe, but we would not need spacesuits to live. We would only need protection from the cold and an oxygen source. However, humans can eventually adapt to the atmosphere due to the relative similarity to Earth’s. The level of galactic radiation on Titan is low because of the far distance from the Sun, making solar flares less dangerous also. This puts Titan as a safer option for humans to live than on worlds like Luna and Mars. We will also be able to use geothermal energy for power as Titan has cryovolcanoes. In all it seems that we will be able to inhabit Saturn’s moon, but only with advanced technology adapting Titan to our needs.

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What’s in a name?: Gonggong & Xiangliu

Much like many of their small world counterparts, Gonggong and Xianglu are a dwarf planet and moon (respectively) named after characters in mythology. Gonggong, a dwarf planet residing in the scattered disc beyond Neptune, is named after a Chinese water god. Gonggong is depicted as having a copper human head, read hair, and a dragon-like body. He is known for causing chaos and destruction and his stories often end with reprimands from other gods. He is accredited for causing flooding and the Earth’s axial tilt.

Gonggong - Wikipedia
Picture of Gonggong, via Wikipedia

Xianglu, Gonggong’s moon, is named after one of the god Gonggong’s ministers. Xianglu is depicted as a nine-headed eel who caused destruction alongside Gonggong and poisoned everything he touched.

Picture of Xianglu, via Wikipedia

In regards to the actual naming process, certain criteria had to be met for potential names and then these names were voted on. The criteria included: being a ‘creation’-related mythological figure, having counterparts that could be used for moon-naming, and having characteristics similar to that of the world being named. Gonggong was chosen for the god’s relation to water that matched the water-related qualities of the dwarf planet.

If you had to name a dwarf planet or moon, what would you choose?

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The Mythology of Jupiter’s Moons

When I heard about the names of Jupiter’s moons, I immediately wanted to dive into the mythology behind them! The four largest moons of Jupiter, each interesting in their features, are also interesting in their mythological stories as people who were lovers of Zeus. In this post, I will briefly describe the story behind these moon’s names, starting with Io.

Io is a Greek myth and the story of a mortal nymph who was a priestess of Hera, wife of Zeus. Jupiter is the Roman name for the god Zeus, so even though this story originated in Greek mythology, Io was still named as a moon for the planet Jupiter. In this myth, Zeus fell in love, or lust, with Io, and wanted to protect her from his wife Hera before she found out he was cheating on her. To do this, Zeus decided to turn Io into a white cow. Hera, however, saw through this, and convinced her husband to give her the cow (Io). She wanted Io to be watched over so that Zeus could not interact with her further, so she sent Argus, a man with 100 eyes, to keep watch on her. Zeus, unhappy with this development, ordered the god Hermes (Mercury in Roman mythology) to kill Argus. In her anger at Io being free, Hera sent a fly to follow and bother the cow, and Io was stuck traveling across the Earth as a cow. She was eventually turned into a human again by Zeus, and she gave birth to his son.

Next is Europa, another Greek myth, with a similar theme of transformation into an animal. Unlike the story of Io, though, it was Zeus who turned into an animal, specifically a white bull. As a particularly beautiful bull, Zeus approached Europa and her group of friends. After petting and fawning over the animal, Europa eventually got on his back, which led to Zeus promptly speeding away into the sea. After traveling some distance, Zeus explained the situation to her and his apparent love of her. They went to Crete and she eventually had his children.

Thirdly, Ganymede is unique because he was actually a male, whereas the other famous lovers of Zeus were female. Ganymede was a beautiful prince whom Zeus abducted after, once again, turning into an animal – an eagle this time. After being abducted, Ganymede was forced to be a cupbearer on Mount Olympus in addition to being his lover. In this story, the lover taken from their home was punished by Hera, notorious for her rage at Zeus’ infidelity. Ganymede was transformed by Hera into the constellation Aquarius, so technically Ganymede has two famous positions in the sky!

The fourth and final large moon of Jupiter is Callisto. Callisto was a nymph and follower of the goddess Artemis, and in order to be part of Artemis’ hunting team, she had to take a vow of chastity. Zeus, being the not-so-great guy that he was, decided he was in love with her, and used deception in the form of turning into Artemis to lure Callisto and take advantage of her. After this was discovered, she was kicked out of Artemis’ group, and (unsurprisingly) turned into a bear, by either Hera in her rage or by Zeus in an attempt to hide her from Hera. Hera then attempted to get Artemis to slay the now bear, Callisto, but Zeus instead turned her into a constellation where she became Ursa Major. Callisto, like Ganymede, has two spots in our night sky.

Throughout these myths, there are some recurring themes, such as Zeus being a terrible person, Hera’s punishments, and turning into animals. These are the stories behind the names of Jupiter’s moons!

Image of Jupiter’s moons

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The Depths of Europa

Comparison of Earth’s and Europa’s Oceans from NASA

The smallest of Jupiter’s four Galilean Moons, Europa hides a world of fascination below its unassuming icy surface. Europa existed unbeknownst to mankind up until the early seventeenth century when the famous astronomer, Galileo Galilei, was first able to resolve Europa through his telescope at the University of Padua. It wasn’t for another three and a half centuries that Europa would first be able to be explored when Pioneer 10 completed the first flyby of the moon in 1973, shortly followed by Pioneer 11 in 1974. These flybys revealed Europa’s ice covered surface, which was when scientists first began to speculate about the presence of a large subsurface ocean on the moon. Since then subsequent missions including the Galileo orbiter of Jupiter, and the New Horizons flyby have provided us with even further data. In fact, scientists speculate that the subsurface oceans could be as much as 60 miles deep, almost 10 times as deep as the deepest point of Earth’s oceans. While there is still so much that we don’t know about this cold moon of Jupiter, it may not be that much longer before questions about Europa’s mysterious oceans are answered. Is there life in its oceans? As soon as the next couple decades, we may be seeing orbiter missions to Europa as NASA was approved $80 million to continue studying the moon. These orbiters could provide to key to answering all those questions we hold.

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The Oort Cloud

The Oort Cloud is a collection of comets that orbit the Sun far outside our solar system. One estimation of the number of comets in the Oort Cloud is one TRILLION. Unlike the Kuiper Belt, which lies outside the orbit of Neptune, the Oort Cloud neither lies on the same plane as the bodies orbiting the Sun nor has objects that revolve in the same direction. The orbital eccentricities of Oort Cloud comets are also random. This is what makes it a “cloud”––it is not all on the same organized plane as the planets, asteroid belt, and Kuiper Belt. In fact, for this reason, many people have never heard of the Oort Cloud. (If you think about it, this makes sense because diagrams of the solar system would be quite complex if they included it). The distance between the Sun and the Oort Cloud is enormous compared to other objects in the solar system. It extends out to 50,000 astronomical units from the Sun! Because these comets orbit so far away, they can be influenced by the gravity of nearby stars in the Milky Way! These gravitational encounters can cause the comets either to be kept out of reach of the planets OR sent hurtling toward the Sun. Those are the comets that we can sometimes observe from Earth.

I am going to admit, I did not know about the Oort Cloud until taking this class. But now that I have learned about it and seen artists’ representations of it, I am blown away by the sheer vastness of it. I cannot believe that even at that great of a distance, the comets still orbit the Sun! I also think that it is cool that the cloud is nearly spherical due to the varying eccentricities, tilts, and directions of orbit by the comets. What seems to be chaotic actually makes for an orderly sphere that encompasses the solar system.

That reminds me of God. He is in the business of creating order from chaos. He is the great Orderer of the universe! He set the comets in motion and the Oort Cloud in its place. He created the gravity that affects so many of the processes of the universe. He fashioned our solar system, and only He can comprehend the vastness of His creation. We just get the privilege of exploring it, each new discovery pointing toward the peaceful order of our Maker.

“For God is not a God of confusion but of peace.”

1 Corinthians 14:33

Did you know about the Oort Cloud prior to Dr. G’s class? Did this blog help clarify or bring perspective to your understanding of it? Let me know in the comments! Thank you for reading! 🙂

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