Asteroid dust brought back to Earth may explain where our water came from with hydrogen clues : The Conversation


Oceans cover more than 70% of the Earth’s surface, and scientists argue that the planet’s interior also contains a lot of water. But where did all this water come from?

My postdoc Ziliang Jin and I analyzed grains of the mineral pyroxene from an asteroid called Itokawa, which is the first asteroid that humankind ever sampled. The Japanese probe Hayabusa brought back about 1,500 particles from the asteroid’s surface in 2010, and our recent measurements show that this asteroid is wetter than we imagined.

Samples of meteorites that came from Itokawa-like asteroids that have been analyzed for water revealed barely detectable quantities. This led scientists to speculate that rubble-pile asteroids like Itokawa would be bone dry. But we found lots of water in these particles. To be clear, the specific amount of water that Itokawa particles contain is still low with respect to anything in our human experience. But the discovery of even these amounts of water with the correct isotope signature means that asteroids like it that struck the Earth could have provided more than half of Earth’s oceans.

I am a cosmochemist at Arizona State University who is interested in the small bodies in our solar system like asteroids and comets, which are the building blocks of the planets. Studying the chemistry of these types of seed materials can tell us a lot about how the planets formed and the conditions in the early stages of planet growth.

We were interested in studying samples from the asteroid Itokawa because we had speculated that Itokawa particles should have some water, based on some back-of-the-envelope calculations Ziliang had done. Then I wrote a proposal to the Japanese Space Agency and received the samples that we ended up studying.

 

Source: Asteroid dust brought back to Earth may explain where our water came from with hydrogen clues : The Conversation

The Trump administration wants to turn the International Space Station into a commercially run venture, NASA document shows. : Washington Post


The Trump administration wants to turn the International Space Station into a kind of orbiting real estate venture run not by the government, but by private industry.

The White House plans to stop funding for the station after 2024, ending direct federal support of the orbiting laboratory. But it does not intend to abandon the orbiting laboratory altogether, and is working on a transition plan that could turn the station over to the private sector, according to an internal NASA document obtained by The Washington Post.

“The decision to end direct federal support for the ISS in 2025 does not imply that the platform itself will be deorbited at that time – it is possible that industry could continue to operate certain elements or capabilities of the ISS as part of a future commercial platform,” the document states. “NASA will expand international and commercial partnerships over the next seven years in order to ensure continued human access to and presence in low Earth orbit.”

 

Source: The Trump administration wants to turn the International Space Station into a commercially run venture, NASA document shows. : Washington Post