GRAIL mission: NASA twin probes to measure moon's gravity field

The GRAIL mission involves twin spacecraft in a polar orbit around the moon to map its gravitational field by measuring changes in distance between them. These changes are due to regional variations in the moon's gravity. The probes will arrive by New Year's Day and take two months to position themselves before starting measurements in March. The data collected will provide detailed insights into the moon's structure, enhancing our understanding of its formation and evolution.

What is the primary objective of the GRAIL mission?

• To study the atmosphere of the moon

• To collect samples from the moon

• To map the moon's gravitational field

• To explore the surface of the moon

How many spacecraft are involved in the GRAIL mission?

• One

• Four

• Two

• Three

When are the GRAIL probes expected to arrive at the moon?

• By Christmas

• By New Year's Day

• By Valentine's Day

• By Easter

What will the GRAIL mission's data reveal about the moon?

• Its magnetic field

• Its internal structure

• Its surface temperature

• Its weather patterns

How will the GRAIL mission help scientists?

• By mapping the moon's surface features

• By studying the moon's magnetic field

• By offering insights into the moon's formation and evolution

• By providing data on the moon's atmosphere