Because light takes time to travel through space, looking at celestial objects means seeing them as they were in the past: the Moon appears 1.3 seconds old, the Sun 8 minutes old, and the Andromeda Galaxy over 2 million years old. This is why astronomers consider telescopes to be time machines that reveal the history of the universe.
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We Can Already See the Past #space #astronomy #universe #blackhole #smartphoneAdded:
Did you know that every time you look into space you're looking into the past?
You don't need a time machine to see the past >> [music] >> because light takes time to travel through space.
When you look at the moon you see it 1.3 seconds in the [music] past.
The sun 8 minutes in the past and the Andromeda [music] galaxy you see it over 2 million years ago.
That's because light [music] even at the fastest speed possible still needs time to cross the universe and our observable universe is about 93 billion light [music] years wide meaning the farther we look the further back in time we see.
Telescopes don't just look through space they look through time.
Don't forget to like share and subscribe for more unreal facts like this.
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