I remember when i was very young. I really wanted to fly. I made my father to buy a chainsaw engine, so i could attach to it some sort of proppeler. With that out of the question(i was sure my dream would surely come true), i needed a parachute. I'm sure...

The Russians had launched the world's first orbiting satellite, Sputnik. America's Vanguard program tried to launch its own space probe, but had met with some embarrassing delays. The US government was anxious to get something into space. Finally,...

No spacecraft had ever visited the distant planet Uranus. Then, in 1986, NASA's Voyager 2 spacecraft, which had flown by Jupiter and Saturn, arrived at the planet. Uranus is one of the four giant planets (the others being Jupiter, Saturn and...

If you put enough matter in one small place, it creates a black hole, a gravitational field so intense that nothing, not even light, can escape from it! A black hole is an extremely weird object. Its intense gravitational field changes space and time...

Gravity was discovered 3 centuries ago by a mathematician and physicist named Sir Isaac Newton. Gravity is a force. It is the force that keeps our feet on the ground and the Earth spinning around the Sun. The force of gravity 100 km (62 miles)...

A galaxy is an island of billions of stars, separated from other galaxies by a vast ocean of almost empty space. The number of galaxies cannot be counted—the observable universe alone may contain 100 billion. Galaxies are classified into three...

Venus rotates backwards compared to the other planets. The atmospheric pressure at the surface of Venus is 92 times that of the Earth. The volume is Venus is 928,400,000,000 km3, while its mass is 4,868,5 x 1020 kg and density is 5.24...

Astronaut Neil Armstrong first stepped on the moon with his left foot. Approximately 115 tons of ocean salt spray enters the earth's atmosphere each second. The first woman in space was a Russian called Valentina...

The largest asteroid is Ceres, is about the size of Texas. Asteroids can contain water, iron, silicates, and some heavy metals - like gold, lead, and uranium. The vast majority of asteroids are grouped in the asteroid belt. Even if there are...

The Sun is around 4.5 billion years old. The center of the Sun is called the core. There are stars that are over 600,000 times as bright as the Sun. The biggest star is VY Canis Majoris, a red hypergiant 5000 light years from the Solar...

Planet Mars diameter of about half the Earth, measuring only 6,800 km across. The mass of Mars is 641,850,000,000,000,000,000,000 kg. Mars is named after the Roman god of war because its red color reminded early observers of blood. Mars is...

Jupiter is the largest planet in our solar system. The mass of Jupiter is 318 times the mass of the Earth. In fact, Jupiter has 2.5 times the mass of all the other planets in the Solar System combined. Jupiter is the fastest spinning of the...