Supermassive Black Holes
A supermassive black hole is a black hole located at the center of every large galaxy. Astronomers are confident that our own galaxy also contains such supermassive black hole at its centre. It has a mass 2.6 million times greater than the Sun, and a similar radius to the orbit of Mars around the Sun.
Hubble - 15 Years of Discovery
The NASA Hubble Space Telescope, named after astronomer Edwin Hubble, is one of the most successful scientific projects of all time. Positioned outside the Earth's atmosphere it has significant advantages over ground-based telescopes — images are not blurred by the atmosphere, there is no background from light scattered by the air, and the Hubble can observe ultra-violet light that is normally absorbed by the ozone layer in observations made from Earth. Since its launch in ...