Tag Archives: cosmic distances

Parallax and Distance Measurement Limitations

Question: Regarding the Parallax method for measuring the distance to a star: Do you use 186 million miles?  Seems to me that in six months the sun has carried the entire solar system a few extra miles that should be … Continue reading

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Light Travel Time from Exploding Stars

Question:  I am not able to understand one thing, when we say we saw a star exploded billions of light years away, does it mean it exploded billions of light years ago but the light reached to you just now. … Continue reading

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The Kerfuffle Over Non-Cosmological Quasar Redshifts

Question:  Some years ago I read an article that said (if I recall correctly) that there were quasars that seemed to be associated with galaxies (maybe in the center), but the quasar’s much larger red shifts implied that their distance … Continue reading

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What is the Universe Expanding Into?

Question:  Thank you for helping so many people. Is there an educated guess by professionals about the difference between what the universe is expanding into and the universe itself?  – Jay Answer:  This is going to sound very paradoxical, but … Continue reading

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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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