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How do we "see" objects so far away from Earth? Are we somehow fetching the light? And if yes, if it's 23 million light years way from us, is it possible that t
by andreygrehov 6y ago
How do we "see" objects so far away from Earth? Are we somehow fetching the light? And if yes, if it's 23 million light years way from us, is it possible that the planet no longer exist at all?
- pier25 6y agoThe Earth is more than 4 billion years old so 23 million years doesn't seem like much.
- alextheparrot 6y agoThey were looking for eclipses - when something blocks the signal they’re observing. In this case, they noticed the X-rays they were looking at were blocked for a few hours. There’s more to it, but the article actually does a good job of explaining it all. There’s not really any way for us to prove if it exists or not today, that information is still quite far away. The best we can do is try to understand the system and make predictions about that.
- notRobot 6y ago> if it's 23 million light years way from us, is it possible that the planet no longer exist at all? Yes, in the same way that if the sun were to suddenly go out, we wouldn't find out for eight minutes (the time that it takes for light from the sun to reach the earth).