Seven down. Three to go. Boom Supersonic—the developer of a 64-to-80-passenger commercial airliner that flies faster than the speed of sound—last week set speed and altitude records with its XB-1 test ...

New research shows that the speed of sound on Mars varies considerably by location and temperature. The findings could help scientists understand sounds picked up by Martian rovers, as well as make ...

Jeff Bezos has reportedly bought a fourth private jet — and it carries a stratospheric price tag of $80 million. The billionaire Amazon founder last month purchased a Gulfstream G700, luxury business ...