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immune system

planet

Space

Why weird star systems are where we'll find alien life

In the hunt for life beyond Earth, we've been looking for planets and stars like our own. But that is flawed – and a new plan promises answers in our lifetimes

Features

Passing star may have disturbed the solar system billions of years ago

Space

Passing star may have disturbed the solar system billions of years ago

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We’ve found 12 new moons orbiting Jupiter – and one is probably doomed

Space

We’ve found 12 new moons orbiting Jupiter – and one is probably doomed

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Solar tornadoes

Space

Tornadoes on the sun could blast hot plasma towards Earth

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Interstellar visitor ‘Oumuamua may be a comet, not an asteroid

Space

Interstellar visitor ‘Oumuamua may be a comet, not an asteroid

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A cell infected with HIV

Health

We can tweak immune cells to be much better at wiping out HIV

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The New Horizons probe is awake and ready for its next flyby

Space

The New Horizons probe is awake and ready for its next flyby

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A day used to be less than 19 hours long 1.4 billion years ago

Space

A day used to be less than 19 hours long 1.4 billion years ago

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A T cell under attack from HIV

Health

We’re beginning to understand how some people can control HIV

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Pluto is not a planet – it's a billion comets squished together

Space

Pluto is not a planet – it's a billion comets squished together

Pluto’s heart-shaped ice plain is full of nitrogen, which hints that the tiny world is made from a billion comets and could have a buried ocean

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Space

Why Saturn's inner moons look like ravioli, cigars and potatoes

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Space

Weird backwards asteroid may be an interstellar interloper

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Space

Falling mini-moons may have created Earth’s first continents

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Space

We’ve lost track of more than 900 near-Earth asteroids

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