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Kepler's supernova remnant

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When we look at the distant Universe, we are looking back in time. The light from many of the stars we see has taken billions of years to reach us on the Earth. This means we can see stars and the galaxies they inhabit at different stages of their lives. A star looks different depending on its age and can eventually be transformed into a different type of object such as a neutron star or black hole.

This section gathers together many of the important types of object that have been detected.

Image: A composite X-ray, visible light and infrared view of Kepler's supernova remnant (credit: NASA/ESA/Johns Hopkins University)

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