Question 1

True or false: MESSENGER's final act was to crash into Mercury's surface, ending its mission in 2015.

Accepted Answer

True. After running out of fuel, NASA deliberately crashed MESSENGER into Mercury on April 30, 2015, concluding its 10-year orbital study.

Question 2

True or false: MESSENGER's name stands for 'Mercury Surface, Space Environment, Geochemistry, and Ranging'.

Accepted Answer

True. The NASA spacecraft MESSENGER was indeed an acronym for MErcury Surface, Space ENvironment, GEochemistry, and Ranging. It orbited Mercury from 2011 to 2015.

Question 3

True or false: MESSENGER found water ice in permanently shadowed craters at Mercury's poles, despite Mercury's scorching dayside.

Accepted Answer

True. Radar and spectrometer data confirmed billions of tons of water ice, hidden in deep craters where sunlight never reaches.

Question 4

True or false: MESSENGER was the first spacecraft to orbit Mercury, not just fly by.

Accepted Answer

True. Before MESSENGER, only Mariner 10 flew past Mercury. MESSENGER entered orbit in 2011, mapping the entire surface.

Question 5

True or false: MESSENGER took the first-ever close-up photos of Mercury's south pole.

Accepted Answer

True. MESSENGER's orbital mission from 2011 provided the first close-up images of Mercury's south pole; Mariner 10's 1974–75 flybys imaged only ~45% of the planet, missing the poles entirely.

Question 6

True or false: MESSENGER discovered that Mercury has a thin atmosphere of oxygen, sodium, and hydrogen.

Accepted Answer

False. Mercury's exosphere was first detected by Mariner 10. Sodium and hydrogen were already known from ground and Mariner 10, and oxygen was detected from Earth. MESSENGER refined the composition, adding magnesium and other elements, so it did not make the initial discovery.

Question 7

True or false: MESSENGER was the first NASA mission to use solar electric propulsion for orbital insertion.

Accepted Answer

False. MESSENGER used conventional chemical propulsion and gravity assists, not ion thrusters. Dawn and Psyche use solar electric propulsion.

Question 8

True or false: MESSENGER confirmed that Mercury's magnetic field originates from a liquid core dynamo, similar to Earth's.

Accepted Answer

True. MESSENGER data showed that Mercury's magnetic field, discovered by Mariner 10, is generated by a liquid iron core dynamo, akin to Earth's, despite the planet's small size.

MESSENGER Trivia Questions