Earth is the fifth-largest planet and the third planet from the sun. Earth is a planet about 12,756 km in diameter. It is believed to be about 4.6 billion years old. Gas and dust that were floating around the sun came together to make the earth. Heavy material became the earth’s core and the lighter material became the crust. Read More

Man has always been curious to explore the space. Exploration of space is the greatest adventure in the history of mankind. Space travel has been possible with the invention of satellites, probes, rockets, space crafts, and space shuttles. Conditions in space are different from those on the earth. There is no atmosphere, no gravity and there is a tremendous variation of temperature. Read More

A constellation is a group of stars. Early astronomers divided the sky into regions that had a distinct group of stars. In 1930, the International Astronomical Union officially set the constellation names and boundaries. There are 88 constellations, in which each star is associated with only one constellation. A quarter of the constellation is visible only from the southern latitude and half of the remainder are quite faint. As the Earth orbits the Sun, many constellations can be seen only during certain times of the year. Read More

The sun along with its nine planets form a Solar System. The sun which is the center of the Solar System is a star. Star is different from the planets. The planets have no heat and light except what the Sun gives them. The nine planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. Read More

The Moon moves around the Earth and Earth moves around the Sun. Our whole Solar System moves to bring changes like day and night and change in seasons. Read More

Meteoroids are small pieces of debris leftover from the formation of the Solar System some 4,500 million years ago. They can be seen flashing across the sky as Shooting Stars. Read More