Space & the Universe
Shields Up: What's Holding Up Human Travel to Mars?
Getting humans to Mars safely means figuring out how to protect the body from the damage of cosmic rays.
More Physics in Action by Topic »
Interview with Astronaut Don Pettit
We talk to Don about scary moments in space, immigrating to Mars, human spaceflight and more.
More People in Physics by Topic »
Why is "C" the speed of light?
We get all sorts of questions in our "Ask a Physicist" inbox, (including a positively disheartening number from people who seem to think it's "Ask a Psychic") but one topic that consistently seems to spark people's imagination and curiosity is the sp..
Einstein's Dreams Review
Einstein's Dreams takes the reader on a journey through different conceptions of time. What if time stood still? What if time slowed down on the highest mountain peaks? Find out why this modern classic is a must-read for those looking to dabble in physics, philosophy, or psychology.