Nothing too serious here. Just poking some fun at our real life super heroes.
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What is the most abundant life in the Universe? That’s a bold question, considering we have yet to see undisputed proof that ET even exists. The only model we have, is on Earth. So let’s unpack that, and see what we end up with.
Earth, 4.6 billion years old. That’s our scale. The scale has already been split into four eons.
The first eon is called Hadean. That first eon, lasted from 4.57 billion to 4.1 billion years ago. At 4.53 billion years, a mars sized object hit the earth, forming the moon. At 4.1 to 3.8, water and organic material begin falling to Earth.
It would be during this eon 4.0-2.8 billion years ago, where life on Earth took a foothold, the Archean eon. They were single celled creatures including microscopic microfossils.
At 3.6 billion years, we can see the emergence of cyanobacteria. These little guys begin to produce oxygen in Earths’ great oxygenation event.
2.5 billion years ago, Earths oxygen level begins to significantly rise.
Notice that Earth is almost half as old as it is now, yet populated with these simple life forms, and there’s nowhere near enough oxygen in the air for animals or humans.
Once the oxygen level starts to rise, multi-celled organisms start showing up. The cells have a protected nucleus, which now house DNA.
At 2 billion years ago, photosynthesis begins to produce more oxygen. Creatures start using oxygen to process fat, sugar, and protein.
At a billion years ago, a super continent forms. Life looks like cool sponges and funky worms. Half a billion years ago, the Cambrian explosion gives rise to more complex animals that evolve and diversify rapidly.
490-445 million years ago, we see the first plants and fungi appear on land, then an Ice age. After this time, jawed fish appear, then more complex plants, increasing oxygen, winged insects.
Then 252 million years ago, the Great Dying event wipes out 95% of life on Earth. Then Dinosaurs take over the planet until Bam, a big rock from the sky wipes them out.
With nothing around to eat plants, plants become trees. Forests become the new modern habitat. With all that food around, mammals start getting bigger and bigger. The first primates appear. Those opposable thumb tree swingers eventually hit the ground That’s when the Earth became the Planet of the Apes
Our sensors are picking up, no wait, we have a visual. Computer, put it on screen. Whoa, that’s new. The image is showing two, not one but two planets in orbit around it’s parent star. It’s not exactly a hi rez image, but it’s enough to be only the second time a multi-planetary system has been captured using direct imaging.
The host star is called PDS 70, located 370 light years away. Its just a baby, only 6 million years old, a bit smaller than our sun, and is still building up steam from its surrounding accretion disk. This is all the stuff in a busy young solar system, that needs to get cleaned up. And that’s exactly what these two planets are doing.
They are big planets, several times bigger than Jupiter. That’s why we can pick them up on visual. As they orbit around the star, they are clearing the debris in their paths.
The inner most planet, PDS 70 b, is the closest to it’s star, 3 billion Km, which is about how far Uranus is from the Sun. Further out is PDS 70 c, closer to 6 billion Km away, like Neptune.
We have images of other fully formed planets, but none like this, not this young.