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With the right material at the right temperature and a magnetic track, physics really does allow perpetual motion without energy loss.

Whether you run the clock forward or backward, most of us expect the laws of physics to be the same. A 2012 experiment showed otherwise.

When the Hubble Space Telescope first launched in 1990, there was so much we didn't know. Here's how far we've come.

Once you cross a black hole's event horizon, there's no going back. But inside, could creating a singularity give birth to a new Universe?

From high school through the professional ranks, physicists still take incredible lessons away from Newton's second law.

No matter what it is that we discover about reality, the fact that reality itself can be understood remains the most amazing fact of all.

With over 300 high-significance gravitational wave detections, we now have a huge unsolved puzzle. Will we invest in finding the solution?

Will we build a successor collider to the LHC? Someday, we'll reach the true limit of what experiments can probe. But that won't be the ...

The measured value of the cosmological constant is 120 orders of magnitude smaller than what's predicted. How can this paradox be resolved?

65 million years ago, a massive asteroid struck Earth. Not only did Jupiter not stop it, but it most likely caused the impact itself.