A telescope is an instrument used for observing distant objects, such as stars, planets and galaxies. Using a system of lenses and mirrors, usually housed in a tubular casing, telescopes ...

Astronomy is the study of energy and the positions, dimensions, distribution, motion, and composition of matter in outer space. It also involves the evolution of celestial bodies and phenomena.

The solar system consists of the central sun and the celestial bodies orbiting it. There are eight planets, with Pluto recently reclassified as a dwarf planet. Six of the planets ...

Johannes Kepler (German pronunciation: [ˈkɛplɐ]; December 27, 1571 – November 15, 1630) was a German mathematician, astronomer and astrologer, and key figure in the 17th century scientific revolution. He is best ...

Sir Isaac Newton FRS (4 January 1643 – 31 March 1727 [OS: 25 December 1642 – 20 March 1726]) was an English physicist, mathematician, astronomer, natural philosopher, alchemist, and theologian who is ...