The universe is expanding. Light from distant galaxies travels toward us even as the galaxies travel away from us; making light’s total travel time longer.
What is the relationship between dark matter and black holes? Dr. Paul Heckert explains MACHOs and WIMPs in the universe.
We hear about black holes a lot, but although they are often mentioned, they are seldom explained. For one thing, a black hole isn’t really a hole at all.
Does the death of a star affect a black hole’s evaporation rates? Dr. Paul Heckert explains astronomy theories to answer a reader’s question.
Fritz Zwicky was the first astronomer to propose the existence of dark matter, supernovas, neutron stars, galactic cosmic rays, gravitational lensing by galaxies, and galaxy clusters. However, he remains virtually unknown to the public to this day.
The Question: If the Earth is rotating on its axis and also revolving around the Sun, why don’t we feel any motion?