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Liquid acoustics half way to the Earth's core

The most direct information about the interior of the earth comes from measuring how seismic acoustic waves—such as those created by earthquakes—travel through the earth. Those measurements show that 95% of the earth's ...

dateNov 24, 2015 in Earth Sciences
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Did we need the moon for life?

For all we know, Earth is the only place in the Universe where life appeared. This makes the mystery of our existence even more puzzling. What were all the factors required to bring about the first lifeforms on our planet, ...

dateNov 23, 2015 in Space Exploration
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NASA vs. cigarettes—a numbers game

People often criticize the amount of money spent on space exploration. Sometimes it's well-meaning friends and family who say that that money is wasted, and would be better spent on solving problems here on Earth. In fact, ...

dateNov 17, 2015 in Space Exploration
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What is tidal locking?

The moon is tidally locked to the Earth, which means that it always shows one face to our planet. In fact, this is the case for most the large moons in the solar system. What's the process going on to make this happen?

dateNov 17, 2015 in Space Exploration
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