Aristarchus (c. 310 B.C.E.–230 B.C.E.), an ancient Greek mathematician and astronomer, made the first claim that the planets of the solar system orbit the Sun rather than Earth. However, it was Nicolas Copernicus (1473–1543) who would...

Humanity's understanding of the geometry of the solar system has developed over thousands of years. This journey towards a more accurate model of our planetary system has been marked throughout by controversy and misconception. The science of...

Between 1970 and 2000, solar system exploration included major missions to most of the planets. The United States sent out many unmanned spacecraft that studied the planets, their moons, and even asteroids. The Soviet Union's planetary missions...

Earth's solar system is comprised of the Sun, nine major planets, some 100,000 asteroids larger than 0.6 mi (1 km) in diameter, and perhaps 1 trillion cometary nuclei. While the major planets lie within 40 Astronomical Units (AU)—the...

Until the 1990s, no one had evidence of planets around Sun-like stars anywhere in the universe, except for Earth and the other eight planets circling the Sun. Then in October 1995, Michel Mayor and Didier Queloz of the Geneva Observatory changed...

assemblage consisting of the Sun—an average star in the Milky Way Galaxy—and those bodies orbiting around it: 8 (formerly 9) planets with about 160 known planetary satellites (moons); countless asteroids, some with their own satellites;...

The solar system shows a multitude of periodic phenomena: from the daily rotations of the Earth, to the monthly phases of the Moon, the seasonal changes during the course of a year, the phases of Venus and other planets, the regular recurrences of...

The solar system is comprised of the Sun and the celestial bodies which it holds in orbit around it by its gravitational force. The Sun itself makes up 99.8 percent of the solar system's mass, while Jupiter, the largest planet, contains only 0.1...

Earth rotates about its polar axis as it revolves around the Sun. Earth's polar axis is tilted 23.5° to the orbital plane (ecliptic plane). Combinations of rotation, revolution, and tilt of the polar axis result in differential...

The Sun, its eight major planets, the dwarf planets and small bodies, and interplanetary dust and gas under the Sun's gravitational control. Another component of the solar system is the solar wind. The Sun contains more than 99% of the mass of...