"If the sun were to suddenly disappear (explode) would the gravitational effects of that be experienced here on earth instantaneously or eight minutes. I guess I am asking if information can travel faster than the speed of light?"
-Tom Wells (age 62)
Different Materials Get Different Temperatures?
Why Is Water Left In A Cup?
Lightning Heating Cables
Why The Number Of Photons Decreases With Energy?
How Do We Know What Will Happen To The Sun?
Light Scattering Off Sound
Why Fill Bottle Rocket 1/3?
Gravitational Effects Other Than The Earth's?
Electrical Conductivity Of Silk
7281 questions have been answered online since 1998 by volunteers from the Department of Physics at the University of Illinois' Physics Van outreach program. We've tried hard to make this the most reliable physics Q&A site on the Web, but no site is perfect, as we explain on this note. Our Baloney feature provides examples of how shaky many other sites are.
If you'd like to ask us a new question, not already covered, please read our answering guidelines first. We try to answer as many questions as we can, but it's not always possible to answer them all. Questions from kids are especially welcome.
Although we recommend not using our informal site as a cited reference, students who are in a rush and can't find a more proper peer-reviewed source can check our citation information section.