earth31 分钟
Extreme particle acceleration: New source of cosmic rays discovered
Scientists discover low-mass microquasars can accelerate cosmic rays, reshaping theories on high-energy particle origins.
NASA's 2 stuck astronauts take their first spacewalk together
NASA astronauts Suni Williams and Butch Wilmore are scheduled to begin U.S. Spacewalk 92 early Jan. 30. Suni Williams and ...