Gaurav Khanna

Latest articles by Gaurav Khanna

An artist's depiction of a supermassive black hole.

The 2020 Nobel Prize in physics awarded for work on black holes. An astrophysicist explains the trailblazing discoveries

By Gaurav Khanna published

Black holes are perhaps the most mysterious objects in nature.

Black Holes
For oversized, spinning black holes, the singularity that a spacecraft would have to contend with would be very gentle.

Spinning Black Holes Could Open Up Gentle Portals for Hypersonic Spacecraft

By Gaurav Khanna published

Feel like visiting another star system or dimension? You can do this by traveling through a spacetime portal of a black hole. But you better choose carefully. All black holes are not created equal.

Black Holes
expert voices, time travel, possibilities, infinite mass

Time Travel Is Possible — But Only If You Have an Object With Infinite Mass

By Gaurav Khanna published

Who wouldn't want to travel in time, glimpsing the dinosaurs or peeking at humans 2,000 years from now? Now physicists have designed a time machine that seems deceptively simple.

The Universe