Zipping outward into our sector of the galaxy? How many stars (and presumeably solar systems) have they reached? Its been 110 years, so is that a spiral shaped band streaming out in concentric shells in all directions at once, or a cone shape, or what. We are anouncing our presence to the whole galaxy for better or worse in the form of radio waves and high energy microwaves. How many of our neighboring star systems have we notified?
2007-03-17 08:07:19 · 8 answers · asked by eggman 7 in Science & Mathematics ➔ Astronomy & Space
Just to augment the other good answers you've gotten, there are some 14,600 star systems within 100 light years of Earth.
2007-03-17 08:53:25 · answer #1 · answered by Chug-a-Lug 7 · 0⤊ 0⤋
Yes, they're still out there. And they always will be. However, in 110 years they've probably become so dispersed that their power has reduced to nothing against the galactic background radiation. Given the relative speed(s) of everything else, the volume of space that is now filled with electromagnetic radiation originating from Earth is rouighly spherical with a radius of about 110 light years. That's a good sized chunk of space and it probably contains at least a few hundred stars.
Doug
2007-03-17 08:16:29 · answer #2 · answered by doug_donaghue 7 · 1⤊ 0⤋
Yes, they'd be travelling out in a roughly spherical wave front. However, remember the inverse-square law ... the signal gets weaker the further it travels. By now, the signal would be so faint that it would be mixed in with the background radiation of the universe.
If anything is Out There Watching Us, it probably noticed the nuclear explosions back in the 1940's and 50's first.
2007-03-17 08:12:36 · answer #3 · answered by jackalanhyde 6 · 2⤊ 0⤋
probably they are
but weert weak
plus actually some radio wawes don't even live our atmosphere as they are reflected back by some layers of the stratosphere
SO I'm not sure Marconi what signals it used,
but there is real Chance they never even left our planet SO heads up
and if Ur interested in aliens receiving it it tell u one secret,
there is alien beeing closer to you at any point in time then then half of the people on this planet,
check out smoking gun proof below
2007-03-17 09:07:32 · answer #4 · answered by infinate wisdom 2 · 0⤊ 0⤋
All matter at a temperature above absolute 0 emits radiation around the excellent EMR frequency selection. the proportion of finished emission at any single frequency is a function of sort of matter and temperature.
2016-10-18 22:37:01 · answer #5 · answered by ? 4 · 0⤊ 0⤋
radio waves are line of sight so it emits as a dome,
any planet within 110 light years could recieve if they are in that line of sight.
They wouldn't really recieve, the backround radiation of space would mix with it and it would be indistiguishable really, would take more power in reality....and they'd have to be listening for it like we do with SETI
2007-03-17 08:12:30 · answer #6 · answered by Justin H 4 · 2⤊ 0⤋
Not spherical unless he transmitted for 24 hours straight (or at least 12), so I guess it's hemispherical.
2007-03-17 08:21:23 · answer #7 · answered by Anonymous · 0⤊ 0⤋
It's OK, we already knew you were here.
2007-03-17 08:10:22 · answer #8 · answered by Anonymous · 1⤊ 0⤋