Experts come up with 10 ways the Earth could be destroyed, including swallowing it with a microscopic black hole, blowing it up with antimatter, hurling it into the sun and switching off gravity.
They are breathtaking, lethal and a constant source of surprise. Saturn's rings have long fascinated humans. Lesser known are the other planets that have rings - Uranus, Jupiter, Neptune, possibly Pluto and Mars. Even Earth has a man made ring.
Exploring two kinds of star clusters in the galaxy that provide scientists with insights into the birth and formation of stars.