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seen Mar 4 at 7:37

Mar
3
comment Why can't I see Mars clearly?
just opening the window won't do all that much, as you're causing a mix of warm and cold air in front of the telescope, but atmospheric blooming at its worst.
Dec
10
comment How would we detect an Earth doppelganger planet?
@called2voyage I'm nowhere saying they are, but the same principle holds for every other signal as well (unless you claim to have a way to send out a type of signal that does not degrade in strength over interstellar distances AND can be detected by us).
Dec
9
comment How would we detect an Earth doppelganger planet?
@JordanBrown detect it has intelligent life NOW? No. Speed of light makes that impossible. Detect it might at some point have had intelligent life? Only if they sent out incredibly strong signals (way beyond what we're doing, and as our technology improves what we send out gets weaker as we're moving away from omnidirectional EM transmissions) and/or is very, very close.
Dec
6
comment How would we detect an Earth doppelganger planet?
you want to detect something that's identical to us, assumption is they're identical to us right now...
Dec
6
awarded  Teacher
Dec
6
answered How would we detect an Earth doppelganger planet?
Dec
6
comment How would we detect an Earth doppelganger planet?
@JordanBrown any planet the size of earth would be extremely difficult to detect, yes. Any civilisation on the level of our own on such a planet would be impossible to detect with any sensors we possess.