Orbital Harmony of TRAPPIST-1 Planets Could Survive Only Limited Early Bombardment

Planetologists investigate origin of heavy bombardment of the moon 3.9 billion years ago

The recent Chinese hypersonic missile tests have fueled concerns about an accelerating arms race between the U.S., China, and Russia. The Chinese weapons system consists of two parts: a fractional orbital bombardment system (FOBS) and a hypersonic glide vehicle (HGV). Here's how it works.

Why China’s Orbital Bombardment System Is Not America’s Sputnik Moment