Leo, a constellation and the fifth sign of the zodiac. The name means The Lion. Leo is bordered on the north by Leo Minor and Ursa Major, on the east by Cancer, on the south by Crater and Sextans, and on the west by Coma Berenices and Virgo. The constellation contains about 100 stars that can be seen with the unaided eye. Brightest is Alpha Leonis, also called Regulus and Cor Leonis.
A dying star can explode with the force of a few octillion nuclear bombs and create any element in the universe. But why do stars go supernova?
Mars, which is the fourth planet from the sun and the third smallest in size, got its name because of its rusty red color. People associated the planet's blood-red color with war, so they named it Mars, after the Roman god of war.