On This Day in History – July 20

A gunman, James Holmes, opened fire in a movie theater during the premier of the Dark Night Rises in Aurora, Colorado, killing 12 people and injuring 58 others.

Part of the Viking program, Viking I became the first American spacecraft to successfully land on Mars and to complete its mission.

Also known as Cyprus Peace Operation or Operation Attila, the invasion was a response to a coup in Cyprus.

A ceasefire came into effect between Honduras and El Salvador after the two countries fought a brief war over immigration El Salvador to Honduras. The hostilities occurred during North American trials of the FIFA World Cup.

Carrying Neil Armstrong and Buzz Aldrin, who would become the first humans to walk on the Moon, the spacecraft safely landed on the Sea of Tranquility on the Moon.

American singer-songwriter

Mexican politician

Mexican/American singer-songwriter, guitarist

New Zealand mountaineer, explorer

Italian scholar, poet

American journalist

English painter

American actor, martial artist

Italian businessman, inventor, developed Marconi's law, Nobel Prize laureate

Mexican general