On 1971, Mariner 9 became the first spacecraft to orbit Mars. At the time, scientists didn't know much about the Red Planet.

The probe will orbit the sun "close enough to pass inside a solar eruption, like a surfer diving under a crashing ocean wave, ...

Last week the Mariner II spacecraft was 7,651,352 miles away from the earth and 28.9 million miles this side of Venus, its destination. As Mariner barreled away from the earth at 7,724 miles an ...

Out of the raw data transmitted back to earth from Russia’s Venus 4 and the U.S.’s Mariner 5 spacecraft, scientists last week pieced together a picture of Venus as a place of unbearable heat ...

We had essentially no informaton on the chemical properties of the planets and their atmospheres until 1969, when NASA launched the Mariner 6 and 7 spacecraft, which both flew within a few thousand ...