Category Archives: Cosmic Distances

Inconsistency Between the Age and Diameter of the Universe?

Question: I have read that the diameter of the universe is 96 billion light years.  How can that be if the universe is a mere 14 billion years old?  Am I to conclude that the 96 billion figure is some … Continue reading

Posted in Cosmic Distances, Cosmic Microwave Background, Cosmology, Galaxies | Tagged , , | Leave a comment

What is the Large Scale Structure of the Universe?

Question: What does the structure of the universe look like at the largest scales? Galaxy cluster are distributed evenly throughout space with no large gaps There are many more galaxies and clusters in some directions (up and down the milky … Continue reading

Posted in Cosmic Distances, Cosmology, Galaxies | Tagged , | Leave a comment

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

Tagged , Leave a comment

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

Posted in Cosmic Distances, Cosmology, Galaxies | Tagged , , | Leave a comment

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

Posted in Cosmic Distances, Cosmology, Galaxies, Physics | Tagged , , | Leave a comment

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

Posted in Cosmic Distances, Stars | Tagged | 1 Comment

Are Quasars and Radio Galaxies the Same Thing?

Question:  I’m interested in the differences and similarities between radio galaxies and quasars. Different sources say different things. Are radio galaxies just quasars with the “jets” pointed away from us, or are there other differences between them?  – Steve Answer:  … Continue reading

Posted in Cosmic Distances, Galaxies | Tagged | Leave a comment

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

Posted in Cosmic Distances, Cosmology, Physics | Tagged , , | Leave a comment

The James Webb Space Telescope and Cosmology

Question:  As per current observations mostly from Hubble telescope and its deep field view, that universe is accelerating much faster at its observable edges, which forms the basis for Hubble constant and the age of the universe. Will the age … Continue reading

Posted in Cosmic Distances, Cosmology | Tagged | Leave a comment

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

Tagged 2 Comments