The black hole at the centre of the galaxy, formally known as Sagittarius A* , fascinates scientists. By mid-2013 a gas cloud is expected to pass in its vicinity at a distance of only 36 light-hours (equivalent to 40.

The discovery of planets in a habitable zone rises the hope that astronomers could soon answer the question of whether we are alone in the universe.

An international team of astronomers has discovered a planet beyond our solar system, which could have perfect conditions for life . The new planet is 22 light years away and orbits its own sun-like star in just the right distance to inherit a moderate climate.

You have just turned 89. What is the biggest satisfaction you have had until now? I don’t know what to say since I have had so many satisfactions with my job.