Stars Question
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If we are using the hubble telescope observe a star that is 20 million light years away, which of the following statements are true?
- The star moving away from us, so the light it emits is moving slower.
- The star has to be made out of hydrogen, otherwise we wouldn't be able to see it.
- We wouldn't be able to see a star that is 20 million light years away because the universe hasn't been around long enough for the light to reach us.
- The star could no longer exist, because the light we are seeing has travelled for 20 million years and the star could have died.