Tag Archives: cosmic distances

Why Can We See Stars That Are Billions of Light Years Away?

Question:  I can’t get seem to find a thoughtful yet scientific answer to this question, I was hoping you could help.  I hope this doesn’t sound dumb, I don’t mean it to be.  When we look at the night sky, … Continue reading

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What is the Difference Between the Redness of an Object and its Redshift?

Question:  What is the difference between Doppler shift of light and Natural light spectra (blue for young and red for old) with respect to stars and galaxies? How does astronomers differentiate between Doppler shift and Natural light spectra of deep … Continue reading

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Where is Voyager 1 Headed and When Will It Get There?

Question:  The Voyager 1 spacecraft has left our solar system and is now in interstellar space but where exactly is it heading now and at its present speed how long will it take to get there.  – David Answer:  I … Continue reading

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How Light Travel Time Affects What We See

Question: If the sun disappears it would take us 8 min. to realize it.  How in the world, what we are seeing in telescopes are still existing?  What we are seeing is light that has been traveling minutes, hours, thousand … Continue reading

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