American space agency Nasa is cancelling all of its space shuttle missions to the Hubble telescope.
It's the shuttles that make sure Hubble is still working, so if no more are sent, it means the telescope will stop working in about four years time.
US space experts want to concentrate on new voyages to Mars and the moon.
The Hubble has changed the study of space since it was launched in 1990. It has sent a stream of amazing pictures from space back to Earth.
"This is a sad day," said Nasa's top scientist, John Grunsfeld, but "the best thing for the space community".