00:00You may not have known this, but the Earth once had rings.
00:04Usually, Saturn is the planet that comes to mind when we think about rings.
00:08However, once upon a time, Earth could have had its own band of dusty particles.
00:13It was due to a phenomenon called ring rain, really.
00:17Our planet was surrounded by lots of little rocks and dust,
00:21perhaps the remnants of a hypothesized ancient planet Theia.
00:25This protoplanet could have existed in the early solar system,
00:28and scientists assume that one day, it could have collided with the early Earth.
00:33In that case, huge remnants of this collision would form our precious moon,
00:38and smaller rocks would result in the rings.
00:40In any case, the particles were pulled toward Earth's surface by gravity.
00:45All this happened around 4.5 billion years ago, shortly after Earth's formation.
00:50We know about them thanks to various sources.
00:53For example, we found some tiny glass beads in ancient rocks,
00:56which might have formed due to intense heat during ring particles' entry into Earth's atmosphere.
01:02We also found things like traces of isotopes in ancient rocks.
01:09Now, these rings would be much smaller than Saturn's, though,
01:12and weren't icy like Saturn's, so they weren't glowing.
01:16Our rings were mostly made of rock and dust.
01:19Scientists believe that they started around 620 miles above sea level,
01:23extending to the Roche limit.
01:25They'd be farther away from Earth than our International Space Station and most satellites.
01:30From the equator, the rings look like a straight line across the sky.
01:34But if you move north or south, they widen, creating a celestial arc.
01:39Near the North Pole, they would gain a subtle twilight effect.
01:43But unlike Saturn's rings that endure, Earth's were fleeting.
01:47Blame the Sun!
01:48Earth's proximity caused waterized particles, potential ring makers,
01:53to turn into gas, leaving no bling behind.
01:56Ultraviolet light from the Sun stripped away the rest.
02:01But what if Earth kept those rings?
02:04Imagine seeing this celestial spectacle day and night.
02:08Visually, it would be stunning, floating elegantly above our planet.
02:12During the day, we'd be adorned with their shimmer,
02:15and at night, they would be so bright and mesmerizing
02:18that they would even outshine the full moon.
02:21However, their impact on our lives wouldn't be that cool.
02:25First of all, the luminosity reflected off the rings
02:28might confuse nocturnal creatures, like dung beetles or swallow-tailed gulls.
02:33They're guided by the starlight.
02:35So poor creatures would be very confused by all this extra glow.
02:39This would disrupt their natural behaviors.
02:41The shadow cast by the rings could mess with our weather patterns as well.
02:46It would affect sunlight levels and pose a challenge for photosynthesis.
02:51Temperatures on the planet would change
02:53depending on the thickness and composition of the rings.
02:56They would impact our seasons and, potentially,
02:59cause even cooler winters and hotter summers.
03:02Satellites in Earth orbit might have faced some chaos as well.
03:06Space rocks hurtling at them could spell trouble for our high-tech companions.
03:10Perhaps things would be better if we kept them initially
03:14and evolved with them already existing, adapted to them.
03:18But if they suddenly appeared right now, it would cause tons of problems.
03:24Well, good thing that only Saturn has rings now.
03:27Or maybe not only Saturn.
03:30Its glowing bands and the famous Cassini division are visible
03:33even through a small telescope or binoculars of an amateur astronomer.
03:38They're super old and might have formed back at the times when dinosaurs roamed Earth.
03:43But, in reality, all four giant planets in our solar system
03:47Jupiter, Saturn, Uranus, and Neptune have them.
03:51Their stunning sets of rings are composed of tons of tiny dust particles,
03:56a mix of rocks and ice,
03:58ranging from tiny bits to sizes as big as a house.
04:01It varies from planet to planet,
04:04and each of them has its own material makeup.
04:06To find out more about this makeup, we can simply look at them.
04:10Some particles are as tiny as sand grains,
04:13while others are as big as double-decker buses.
04:16We also look at how reflective they are,
04:19and how much they sparkle.
04:21Saturn's rings, for example, are mostly waterized,
04:24and they look like sparkly frozen droplets.
04:27Jupiter's rings, however, are more dusty,
04:30with fine rocky particles, similar to asteroids.
04:32Uranus keeps its ring material a secret,
04:36but it's dark and not so sparkly,
04:39hinting it's not waterized.
04:41Instead, it could be carbon,
04:42or carbon-containing dust,
04:44maybe even charcoal.
04:46And Neptune takes it up a notch.
04:48Its rings are even darker,
04:50suggesting superfine dust,
04:52maybe carbon or methane ice.
04:54Scientists also study what sort of light these particles emit.
04:58They split this light into a spectra,
05:01and look at the ring's secrets.
05:03For example, waterized, iron, and organic tholins
05:06are given the rings a reddish tint.
05:10And these giants are not the only ones in the universe
05:13who have this cool feature.
05:15For example, there's a planet way beyond our solar system,
05:18called J1407b.
05:21It has rings 200 times wider than Saturn's,
05:25and it looks insane.
05:27The planet was called Super Saturn by NASA.
05:30On the other end,
05:31there's an object with only two tiny rings,
05:34called 10,199 car-iqlo.
05:37If the Super Saturn is most likely a giant with huge gravity,
05:42then this thing is very tiny.
05:43It's not even a planet.
05:45It's the so-called centaur,
05:47which is what we call small celestial bodies.
05:49In the case of faraway planets,
05:52usually we find their rings thanks to radio waves.
05:56All planets or satellites send out radio signals.
05:59When these signals pass through the rings around them,
06:01it results in a weird and pretty crazy symphony.
06:04The size and weight of particles in the rings decide the nodes.
06:08For example, lighter particles like aluminum
06:11have their own groove, which is different from irons.
06:14Now, the true mystery is how they're formed at all.
06:19Each of the planets in our solar system has its own ring history.
06:24In Saturn's case, scientists thought that maybe it had some huge moon,
06:29and then this moon broke apart for some reason,
06:31after a collision, for example,
06:33resulting in fascinating rocky bands.
06:36But if we sum up all the rocks,
06:38they don't result in a big enough object.
06:41So that theory most likely isn't true.
06:43They might have appeared because of the collision,
06:46but between some other objects.
06:47Jupiter's faint rings come from dust particles
06:51flung into orbit by micrometeorites.
06:53Neptune has not really rings, but rather arcs.
06:57They're not complete circles around the planet,
06:59but just parts of the circle.
07:01They're influenced by the gravitational pull of the moon Galatea.
07:05And finally, Uranus's mysterious rings,
07:08like red and blue ones, puzzle scientists.
07:11We have no idea where they came from.
07:13Same with super Saturn and a centaur we mentioned before.
07:19The rings in our solar system have their own future.
07:23The sad truth is that Saturn will lose its iconic rings one day.
07:27NASA's Cassini spacecraft show that they're slowly being pulled into the planet
07:32by gravity and magnetic fields.
07:34It happens so fast that Saturn's ring ring
07:37could fill an Olympic-sized swimming pool every half hour.
07:41So one day, what was once a spectacular sight stretching 22 times the length of Earth
07:47will shrink to almost nothing, becoming just a tiny part of Saturn.
07:52But hey, don't worry.
07:53Despite the speed, it will take about 1 to 300 million years
07:57for all the rings to fully vanish.
08:00But there's an upside.
08:04Mars might gain its own rings one day.
08:07Although it will take a long time, too.
08:09In the next 30 to 50 million years,
08:12Mars could witness its moon Phobos breaking apart
08:15and forming a dazzling band around the planet.
08:18The pieces that don't contribute to the ring
08:20will create craters on the Martian surface.
08:23So let's hope we won't live on this planet by that time.
08:26Scientists and NASA hope to study the rings of different planets better in the future.
08:31In the meantime, the James Webb Space Telescope
08:34will keep scanning and analyzing them.
08:37Let's hope that we'll learn more about their mysteries
08:39and our solar system's history.
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