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Asked by anon-218294 to Anna, Emma, johnpaterson, Richard on 19 Jun 2019.
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Emma Markham answered on 19 Jun 2019:
This is a great question. It is thought that there is one hundred billion Milky Ways (galaxies) within the observable universe. I can’t even imagine that number!!!
I think this is why many scientists predict there must be other life in the universe, because there are so many galaxies with exoplanet, which have suitable conditions for life to occur. Unfortunately we have not find any evidence of extraterrestrial life yet. Do you think there is life on other planets?
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John Paterson answered on 20 Jun 2019: last edited 20 Jun 2019 6:15 am
The Milky Way is what we call the galaxy that includes our own solar system. You can see it in the night sky but we are also part of it. This is because we are only a tiny bit of it and the Milky Way itself is huge – the whole Milky Way is about 100,000 times the size of our entire solar system, from the Sun out to past Pluto. So even though we are part of it, we can still see the rest of it all around us because it is so massive.
Like Emma said, the Milky Way is just one galaxy of billions. Some scientists have argued that there are actually an endless number of galaxies and the universe itself is endless – it just keeps going on and getting bigger and bigger. Some scientists disagree with this. When it comes to space there is so much we still don’t know!
Comments
anon-218294 commented on :
Interesting! Thank u so much Jonh and Emma!