NASA astronauts make second spacewalk; repair faulty ISS cooling system

Two US astronauts successfully fixed a faulty cooling system on Tuesday working outside the International Space Station (ISS).

US astronauts begin spacewalk for station repairs

Two US astronauts today stepped outside the International Space Station for the first of three spacewalks to fix a broken equipment cooling system, NASA said.

Rare moon rock found on earth

Scientists have stumbled upon tranquillityite, a mineral considered unique to the moon.