NASA's treasure map for water ice on Mars

NASA has big plans for returning astronauts to the Moon in 2024, a stepping stone on the path to sending humans to Mars. But where should the first people on the Red Planet land?

Infectious cancer in mussels spread across the Atlantic

An infectious cancer that originated in one species of mussel growing in the Northern Hemisphere has spread to related mussels in South America and Europe, says a new study published today in eLife.

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Northern Hemisphere

Coordinates: 45°0′0″N 0°0′0″E / 45°N 0°E / 45; 0

The Northern Hemisphere is the half of a planet that is north of the equator—the word hemisphere literally means 'half sphere'. It is also that half of the celestial sphere north of the celestial equator. Earth's northern hemisphere contains most of its land area and most of its human population (about 90%).

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