Mercury has the shortest period of revolution (about 88 days), and Pluto has the longest (about 248 years).

Mercury and Earth are the densest planets in the Solar System  with densities similar to the iron-rich mineral haematite. Saturn, the least dense planet in the Solar System...

The outer planets are gas giants Jupiter and Saturn and ice giants Uranus and Neptune. Beyond Neptune, a newer class of smaller worlds called dwarf planets reign, including long...

Mars is known as the Red Planet. It is red because the soil looks like rusty iron.

On July 20, 1969, three astronauts of #Apollo11, Neil Armstrong, Buzz Aldrin, and Michael Collins, made history. Armstrong and Aldrin became the first humans to walk on the Moon...

Saturn has overtaken Jupiter as the planet with the most moons, according to US researchers. A team discovered a haul of 20 new moons orbiting the ringed planet, bringing its to...

The distance of The Moon from Earth is currently 370,123 kilometers, equivalent to 0.002474 Astronomical Units. Light takes 1.2346 seconds to travel from The Moon and arrive to...

The first private human spaceflight took place on 21 June 2004, when SpaceShipOne conducted a suborbital flight.

Galileo Galilei was the first person to scientifically observe the Moon and publish his discoveries . In late 1609 he discovered that the Moon was not a smooth heavenly sphere b...