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/sci/ - Science & Math

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9517157 No.9517157 [Reply] [Original]

>seeing an object X amount of light years away is the same as seeing it as it was X light years ago

So basically we have no idea what's happening in deep space? There could be an entire superculture of space faring aliens with dyson spheres that are invisible to us because we have lightspeed lag time?

>> No.9517159

>>9517157
A lot of it is already dead. Stars burn out.

>> No.9517162

>>9517157
Yeah, pretty much. Ayys could literally have built a giant shining goatse with stars that we wouldn't see for millions of years if they're far away enough.

>> No.9517177

Polaris only became visible about 50 years ago. So yes, that means we're seeing the north star as it was when it was only 50 years old.

>> No.9517187
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9517187

>>9517177
>Polaris only became visible about 50 years ago

>> No.9517195
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9517195

>>9517157
exactly, there is no time travel telescope, this pisses me off, you can only summon UFO's through meditation

>> No.9517196

>>9517157
does it make sense to speak about a present moment somewhere that far then?

>> No.9517218

>>9517187

Learn some astrophysics before you judge

>> No.9517233

>>9517177
We see Polaris as it WAS about 430, not 50, years ago.

>>9517196
Strictly speaking, no, it doesn't.
We can change what we consider to be "now" at the center of the galaxy by accelerating towards or away from the centerpoint.
Physicists (when not being pedantic) usually means that what's happening "now" at point X, 1000 lightyears away, is what we'll see in 1000 years PROVIDED we and point X are nearly stationary and remain so during the time it takes light to get here.

>>9517162
Betelgeuse has quite likely exploded "already" but we'll have to wait to find out.

>> No.9517253

>>9517233
cool anwser anon

>> No.9517263

So basically we'll never know what's happening in space because we have to passively absorb light? What if you could send something to meet the light and bounce back in order to cut the lag time?

>> No.9517270

>>9517218
But what the fuck are you talking about?
Polaris has been catalogued since 2nd century.

>> No.9517318

>>9517263
>What if you could send something to meet the light and bounce back in order to cut the lag time?

Let's send a probe then. For it to cut the lag, it has to look at a star, take a photo, and travel back to earth at speeds arbitrarily higher than light speed, otherwise it would make no sense. Now that we have the plan, care to give us ideas to violate this physics law?

>> No.9517463

>>9517318

easy. use the black hole or the gravitational waves.

wait, better use the worm hole... or maybe the dark energy.

antimatter?

see, you dumb sarcastic shit. there are so many ways to do anything we need!

>> No.9517616

>>9517463
Gravitational waves only travel at lightspeed.
No one knows how to build a wormhole -- or if it's even possible.
Your other "suggestions" are regurgitations of popsci buzzwords you probably don't know the meaning of.

>>9517318 is right and you are a fatuous idiot!

>> No.9517685

>>9517463
You don't know how to write a sentence like a grown up, trust me you haven't figured out shit.