So, there are a lot of stars in the Universe.
And a lot of them have planets. Planets outside the Solar System are called exoplanets. Astronomers have looked for planets around a lot of relatively nearby stars. At least 1 in 20 of the stars has planets. Each of these stars could have several planets, and some of them could have planet-sized moons.
Nobody knows, but there could easily be about the same number of planets and large moons in the Universe as there are stars.
That’s a lot of places that COULD be something like the Earth.
Life has developed on Earth, and life is certainly amazing. Many people believe that something similar could have happened on other planets or moons.
Do you think that the start of life is something so unlikely that it could happen only once? Or can life arise wherever the conditions are ‘right’? What could those conditions be?
Life in the Solar System