View of the terminator over the Earth's limb taken during mission STS-111 UF-2.

STS111-E-5035 (8 June 2002) --- One of the astronauts aboard the Space Shuttle Endeavour noticed this interesting cloud pattern and captured it with a digital still camera. A low Sun illuminates and colors the cloud tops of a long arc of towering clouds associated with either a cold front or a squall line advancing from right to left.