Not as in illiegal immigrants
- Yes I doVote A
- No of course they are not realVote B
- I am not sureVote C
Most Helpful Girl
They are so many galaxies we would be foolish to think we are the only species and creatures in the entire milkyway Galaxy3
Most Helpful Guy
Let's put it this way:
Our solar system has 9 planets (as of right now ;-)). There are an estimated 300-400 billion stars in our galaxy, the milky way. Not all of these stars have planets like our star does but there are a rough total of 150 billions planets out there - in our galaxy alone. Now, unfortunately it is not possible with current technology to know how big exactly our whole universe is. The reason for this is that at the edges of our universe, space is expanding so fast that the light from these extremely remote places has not reached earth yet. However, scientists have made an attempt at calculating how many galaxies there are in the KNOWN and observable part of our universe. The number is 100 billion. Of course some of these galaxies might be smaller than our but we already know that there are also much, much larger ones (in fact, at the moment it looks as though our milky way is a relatively small galaxy compared to other). If we assume that other galaxies have at least the same amount of planets as our galaxy does, we have a rough estimate of 150 billion times 100 billion planets in our universe. That gives us this number:
150,000,000,000,000,000,000,000. To put that in a context that is better to understand and imagine: there are more planets in our universe than all the grains of sand on all the beaches of our whole earth combined.
It is thus very, very likely that life exists outside of our solar system. Statistically, it seems almost impossible that we're the only life forms in the whole universe. And the chance of alien life existing becomes even bigger as we are getting to know more and more things about our own world. For example until recently, researchers believed that life needs "comfortable" conditions such as temperatures that are not too hot and not too cold. But then they found bacteria and other small life forms living in very extreme conditions, such as on the walls of under-water volcanoes, where temperatures reach 400 or 500 degrees celsius. They also found small snails living in complete darkness and very cold temperatures in a large cave in South America. And perhaps the most remarkable thing about these snails is that they are not eating organic materials but they are feeding off the rock they live on (they are able to turn the minerals from the rock into nutrition).
So when we take these life forms also into account, I'd say life must exist outside of our solar system.4
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