An Earth-sized planet found in the habitable zone of a nearby star : The Conversation


NASA scientists have discovered a new planet orbiting around a nearby star that is in a habitable zone. But does this planet have liquid oceans that can support life?

Source: An Earth-sized planet found in the habitable zone of a nearby star : The Conversation

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

Earth Day 2015


The Soapbox

In honour of Earth Day, here’s a video showing the beauty in our natural world. Incredible!

Greenpeace released this important and moving video about what we truly ‘need’ – clean air, safe water, protected rainforests and biodiversity. Take a look:

This is also another important video from the Gaia Foundation, about how our modern consumption is taking a severe toll on the sustainability of this incredible planet.

Earth Day is a special occasion for us to stop and think about the beauty of the natural world, take it all in and to think long and hard about how we can preserve this beauty for future generations. Small everyday acts of kindness towards our planet, each other and to the millions of species we co-exist with can help us preserve scenes like the ones we’ve just seen for generations to come. There are thousands of ways to take part in Earth…

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