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What is gravity?

13 July 2004

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In 2000 the European Space Agency decided to honour one of the world's most illustrious scientists by giving the name of Isaac Newton to the Agency's XMM mission. The X-ray space telescope, launched on 10 December 1999, was renamed the XMM-Newton observatory.

Credits: Isaac Newton Institute for Mathematical Studies

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Albert Einstein in Princeton, USA.

Credits: Doctor Thaddeus Ozone

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Searching for gravitational waves with LISA

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LISA will be the first space-based mission to attempt the detection of gravitational waves. These are ripples in space that are emitted by exotic objects such as black holes.

Credits: ESA

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LISA

The fundamental forces of nature The electromagnetic spectrum Space-time as an elastic fabric What are 'dark matter' and 'dark energy'?