A moon orbits around this type of large celestial globes composed of rock, liquid, or gas which, in turn, revolves around a star.

In 1930, French astronomer Bernard Lyot invented the coronagraph, allowing scientists to view the Sun without waiting for a celestial body to cast a shadow on the Sun, otherwise known by this term.

On March 13, 1781, William Herschel discovered Uranus using a this homemade instrument.

The New Moon, Waxing Crescent, First Quarter, Gibbous Waxing, Full Moon, Gibbous Waning, Last Quarter and Waning Crescent are this.

The Planets in order of closest to the sun to farthest from the sun

Between 1868-1938, American astronomer George Hale studied these dark, cooler areas of the sun's photosphere and discovered the magnetic fields within them.

In 2006, Pluto was reclassified as a minor planet in the solar system. A minor planet in the solar system is referred to by this term.

In 1610, the first systematic study of Jupiter's 4 largest moons, Io, Ganymede, Callisto, and Europa, collectively known by this term, is credited to Galileo.

The name for the surface of the Sun

Between 1974-1975, the "Mariner 10" flew past this planet, whose name starts with M, three times to take overlapping photos of the surface of the planet.

In 1846, Johann Galle finds this planet.

In 1660, Robert Hooke reports observing a giant spot on this planet's surface. The planet's atmosphere and moons were studied by the "Galileo" in 1995.

Large eruptions or loops of flaming gas from the Sun's surface are called this.

This mobile robot explored the surface of Mars in 2004 along with mobile robot, "Opportunity".

In 1655, the Dutch scientist Christiaan Huygens correctly identifies this planet's rings. In 1979, the "Pioneer II" explores that planet's rings, and, in 2004, "Cassini" studies the planet's moons and rings.

On July 20, 1969, US astronauts by these names became the first humans to walk on the moon.

In 1930, Clyde Tombaugh, a US astronomer, discovers this planet.

Between 1990-1994, "Magellan" mapped 98% of the surface of this planet.

A large planet that is mostly composed of gas is called this.

The first lunar atlas is published in this year by Johannes Hevelius.