On 24 April 1990, the NASA/ESA Hubble Space Telescope was sent into orbit aboard the space shuttle Discovery. Now it is celebrating its 26th anniversary. As in the last years Hubble spent a modest portion of its observing time to observe a special chosen object. This year, Hubble re-observed an object, it already captured over 15 years ago: NGC 7635, better known as the Bubble Nebula.
