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Mariner 10

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description Mariner 10 Overview

Mariner 10 was a robotic space probe launched by NASA in November 1973 to conduct planetary flybys of Venus and Mercury. It holds the distinction of being the first spacecraft to utilize a planetary gravity assist, using Venus's gravitational pull to alter its trajectory toward Mercury. Over the course of its mission in 1974 and 1975, Mariner 10 successfully executed three separate flybys of Mercury, mapping approximately 45% of the planet's surface. The mission provided scientists with the first close-up images of Mercury's heavily cratered terrain.

help Mariner 10 FAQ

How did Mariner 10 use Venus to reach Mercury?

Mariner 10 flew past Venus and used the planet's gravity to alter its trajectory toward Mercury. This was the first planetary gravity-assist maneuver used by an interplanetary spacecraft.

Why did Mariner 10 encounter Mercury three times?

The Venus-assisted orbit placed the probe in a repeating solar orbit that returned it to Mercury. It completed three Mercury flybys in 1974 and 1975 rather than entering orbit around the planet.

What did Mariner 10 discover about Mercury?

The probe returned the first close-up images of Mercury and revealed a heavily cratered surface. Its instruments also detected that Mercury has an intrinsic magnetic field, an unexpected result for such a small planet.

How was Mariner 10 different from NASA's later MESSENGER mission?

Mariner 10 only flew past Mercury and imaged the same broad hemisphere during its encounters. MESSENGER entered Mercury orbit in 2011, allowing it to map the entire planet and study long-term surface and magnetic conditions.

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