"The Butterfly Nebula shows what happens to a star at the end of its life, when it loses all of its gas and dust to its surroundings. Not only is this a reminder to the eventual fate of our own Sun and Solar System, but Hubble's unique ability to witness
Credit: NASA/ESA/Hubble SM4 ERO Team
As the famous telescope turns 25, scientists who worked on the project choose their favourite pictures.
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