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Q & A: Physics Questions? Ask the Van

Physics Questions? Ask the Van

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Question of the Day

"Using our thought measurementment, 186,000 miles per second as the speed of light, how would it be measured in terms of someone from a different star system who does not use our standard of measure? Is there not a universal constant to measure light speed. If light and time relevant, then build a clock for the planet Jupiter and Earth which has a day of about 9.86 hours and a year of 4332.7 days. Do time and distance really exist or is it just a perception complicated by numbers. Thanx Gerry"
-Gerry (age 11)

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About Us

6760 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.

Questions from kids are especially welcome!