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solar system

Mercury crossing the sun

Space

How to watch Mercury pass in front of the sun today

You'll need special telescopes to watch the innermost planet transit the sun, an event lasting around seven hours, or you can watch online

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blood test

Health

Having an overactive immune system may prime you for depression

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swansong earth

Earth

Last days of Earth: Life in 7 billion years AD

Features

Strange Manx comet is time capsule from the early solar system

Strange Manx comet is time capsule from the early solar system

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Makemake shining brightly, with a small, faint blob just above it and a big arrow pointing to it

Space

Never-before-seen moon spotted around dwarf planet Makemake

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Saturn's rings as seen from space

Space

Cassini gears up for final fiery plunge into Saturn's atmosphere

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solar system

Earth

How two tiny dots defy the history of life and the solar system

Features

The HAWC observatory near the Sierra Nevada volcano in Mexico

Space

Water telescope’s first sky map shows flickering black holes

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Cassini circling Saturn

Space

Saturn probe Cassini hoovers up dust from distant stars

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Front page of The Sun newspaper, headlined 'World's end'

Space

Ease up doom mongers, Planet Nine is not about to destroy us

Contrary to tabloid tales, a distant extra planet in our solar system is not about to send comets raining down on us, says astronomer Phil Plait

Comment

Space

Mars moons may have formed after collision with Pluto-like world

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Space

The play X will have you clock-watching - but in a good way

CultureLab

Space

Planet Nine might be an exoplanet stolen by the sun

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Space

Pluto may have tipped over when Charon tugged at its heart

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