The study of matter in outer space.
A large object moving around the sun (there are 8).
A technical instrument used to see distant objects such as stars.
A scientist who makes observations and studies planets, stars, galaxies, and anything in space.
The first human being to set foot on the moon.
A group of stars that people have imagined to represent various objects.
A group of stars, gas and dust held together by gravity (ours is the Milky Way).
Ice, particles of dust and dirt, and gases that orbit the sun.
A medium-sized rocky object orbiting the Sun.
A small object revolving around a larger object.
A bowl-shaped depression formed by the impact of a meteoroid.
The natural force of attraction between any two objects.
When one object, such as Earth or the moon, casts a shadow upon another.
An event during which Earth passes between the sun and the moon and creates a shadow across part or all of the moon.
An event during which the moon passes between the sun and Earth and creates a shadow across part or all of the sun.
A particular stage of the moon's cycle, during which it has characteristic appearance, such as the full moon phase or crescent moon phase.
The path followed by an object in space as it moves around another object.
The imaginary line running through a planet from the North Pole to the South Pole.
One complete passage of Earth around the sun.
One complete passage of Earth around its axis.
A period of about 3 months characterized by certain weather, caused by the tilt of the Earth.
A gradual increase, as in the gradual increase in size of the lit surface of the moon during part of the moon's cycle.
A gradual decrease, as in the gradual decrease in size of lit surface of the moon during part of the moon's cycle.
The rise and fall of the level of the oceans.
How much matter an object contains.
To make light bounce off a surface.
A group of seven stars that are part of the constellation Ursa Major (spoon with long handle).
The star at the end of the handle of the Little Dipper (also known as the North Star).
Mercury, Venus, Earth, Mars (orbits closest to the Sun)
Jupiter, Saturn, Uranus, Neptune (orbits outside of Mars)
A bright streak of light in the sky caused by a meteoroid entering into Earth's atmosphere
An event that happens twice each year, when the tilt of the Earth's axis is inclined neither away from nor towards the sun.