Planets
Asteroids may have delivered water to early Earth
Scientists shot mineral pellets at a simulated planet. It showed an impact wouldn’t have boiled off all of an asteroid’s water.
HS-ESS1-6
Apply scientific reasoning and evidence from ancient Earth materials, meteorites, and other planetary surfaces to construct an account of Earth's formation and early history.
More Stories in HS-ESS1-6
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PlanetsHow Earth got its moon
How did our moon form? Scientists are still debating the answer. It may be the result of some one big impact with Earth — or perhaps many small ones.
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SpaceCool Jobs: Probing Pluto
The New Horizons mission captivated the world as it flew by Pluto. Here are some of the people who made that possible.
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EarthOxygen-rich air emerged super early, new data show
Scientists had thought animals were slow to emerge because they would have needed oxygen-rich air to breathe. A new study finds that plentiful oxygen may have developed early. So animals may have been late on the scene for another reason.
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EarthCool Jobs: Mapping the unknown
Scientists find different ways of exploring places humans will never visit — and drawing maps to help us better understand such mysterious places.
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FossilsClues to the Great Dying
Millions of years ago, nearly all life on Earth vanished. Scientists are now starting to figure out what happened.
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SpacePollution may give ‘first’ stars a youthful look
The oldest stars should be made of only light elements. But these suns may have sucked up heavier elements, giving them a more youthful appearance, a new study finds.
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PlanetsPluto hosts ice mountains, data suggest
Geologic activity appears to have been reshaping Pluto, erasing craters and more.