All Questions
Tagged with astronomy astrobiology
2 questions
4
votes
3
answers
273
views
Why do we search for extra-terrestrial water?
When searching for signs of extra-terrestrial life, the key primary challenge as of now seems to be searching for signs of water on other planets. Presumably, this is because on Earth, water is ...
- 143
12
votes
2
answers
633
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Interstellar eavesdropping
For about a century, humanity has broadcasted noise to space in the form of TV broadcasts, radio, etc...
The nearest star is 4.242 light-years away, so for about 90 years, aliens -- if they exist in ...
- 121