Latest Donald Brownlee Stories
Stardust NExT must love comets - on Valentine's Day the spacecraft will get up close and personal with its second.
Particles from any icy comet that were collected and returned to Earth aboard a NASA science satellite show dozens of minerals that form only in extreme heat -- a finding that complicates theories about how the solar system formed, scientists said on Monday.
Pristine comet samples returned this weekend by the Stardust spacecraft after a 2.9-billion-mile (4.7-billion-km) journey wildly exceeded scientists' expectations, project managers said on Thursday.
- A transitional zone between two communities containing the characteristic species of each.