Sponsored Links

Moon discovery may expand where we search for alien life

The lunar magnetic field lasted much longer than scientists originally thought.
Sven Robbe / EyeEm via Getty Images
Sven Robbe / EyeEm via Getty Images
Swapna Krishna
Swapna Krishna|@skrishna|August 9, 2017 2:00 PM

Every discovery we make about the universe has implications for us. Understanding how our solar system formed, and how we got here, helps us figure out how likely it is that we'll find life on other planets. Even just our corner of the galaxy is vast; anything we can do to help narrow the possibilities of where we can and should search for life beyond our planet is helpful. And that's why a new study from Rutgers and MIT is so interesting. A team discovered that the moon's magnetic field survived much longer than previously thought.

The Earth's magnetic field is what protects us from space radiation. Some comes from outside our galaxy, but our sun also emits highly charged particles that would be incredibly harmful if we weren't protected from them. (That's one of the serious concerns about sending astronauts to Mars and beyond: How do we protect them from radiation when they're outside the protection of the Earth's magnetic field?) As far as scientists know, a magnetic field is a key ingredient in finding life on another planet, but they were under the impression that a body as small as the moon wouldn't be able to support one for very long. This new study may prove that theory wrong.

In order to conduct their experiments, the team used moon rocks that were collected by astronauts on Apollo 15. Objects lose their magnetism when exposed to extreme heat, so Sonia Tikoo, the lead author of the article published in Science Advances, heated the lunar rock to 1,436 degrees F and demagnetized it. She was then able to determine what its original magnetization was; it was higher than expected.

Scientists have dated the lunar rock to between 1 billion and 2.5 billion years old. This means that the moon's magnetic field, which was once as strong as the Earth's, lasted a lot longer than scientists thought. It was still active as of 2ish billion years ago. The moon currently has no magnetic field, but scientists are unclear as to when it shut down. In comparison, Mars lost the bulk of its magnetic field about 4 billion years ago.

Turn on browser notifications to receive breaking news alerts from Engadget
You can disable notifications at any time in your settings menu.
Not now

Not only did we just find out more about our satellite, but this study tells us that we possibly should be looking at exomoons as potential hosts for life, in addition to exoplanets. "The question becomes what size planets and moons should we be considering as possibly habitable worlds," said Tikoo. The answer is clear: We have a lot more work to do.

All products recommended by Engadget are selected by our editorial team, independent of our parent company. Some of our stories include affiliate links. If you buy something through one of these links, we may earn an affiliate commission. All prices are correct at the time of publishing.
Moon discovery may expand where we search for alien life