This is a galaxy with a characteristic pinwheel shape with a flat disk, central bulge, and graceful arms containing regions where young stars form.

This is a galaxy consisting of mostly older stars that has no dust lane and is fairly featureless. The shape can range from spherical to highly elongated.

This is a galaxy that does not have a regular shape, like a spiral or an elliptical galaxy. The shape of one of these is uncommon and often were once spiral or elliptical galaxies and were deformed by gravitational action.

The distance light travels in one year

A large spiral galaxy that is home to Earth and the rest of our solar system, and about a trillion stars.

This is the period of time it takes for earth to make a complete rotation on its axis; 24 hours

This is the period of time it takes for earth to make a complete revolution (a full orbit) around the sun; consists of 365 days, 5 hours, 49 minutes, and 12 seconds

Describe the motion that occurs when the Moon rotates on its axis and revolves around the Earth.

This is the appearance of the illuminated (sunlit) portion of the Moon as seen by an observer, usually on Earth.

This is a natural satellite that orbits a planet or smaller body, which is called the primary.

A small, rocky object that orbits the Sun

A small, rocky and icy object that orbits the Sun

A meteoroid that has entered Earth's atmosphere and produces a streak of light

An instrument that separates visible light into its various wavelengths.

An imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates

One of four major divisions of the year based on the Earth's tilt and the light from the sun.

An orbit of one object around another object

Telescopes or other instruments that have been launched into outer space to collect data on distant planets, galaxies, and other celestial bodies.

This is the very high and low tides that occur during the new moon or the full moon when the sun, moon, and earth are approximately aligned.

This is the tide that occurs twice a month, when the difference between high and low tide is least; the lowest level of high tide.

The spin of an object around its axis

This is a celestial body in orbit around a star.

A magnetic storm on the Sun which is a very hot, bright spot that usually occurs near sunspots; an explosion that releases huge amounts of high-energy particles and gases and are ejected thousands of miles from the surface of the Sun; can also cause sunquakes

This is the Sun and the celestial objects bound to it by gravity. This includes the eight planets and their 166 known moons,four dwarf planets, and billions of small bodies, including asteroids, comets, meteoroids, and interplanetary dust.

An occurrence during which the Moon moves into Earth's shadow

an occurrence during which the Moon's shadow appears on Earth's surface

Phases of the Moon during which more of the moon;s near side is lit each night

The apparent surface of a star

An uncrewed spacecraft sent from Earth to explore objects in space

Phases of the moon during which less of the Moon's near side is lit each night

A dark area of gas on the sun's surface that is cooler than surrounding gases.

What happens when two objects line up and one is blocked from view

A telescope that uses lenses to gather and focus light form distant objects

A telescope that uses a mirror to gather and focus light form distant objects

A telescope that collects radio waves and some microwaves using an antenna that looks like a TV satellite dish

A huge, reddish loop of gas that protrudes from the sun's surface, linking parts of sunspot regions.

A meteoroid that strikes a planet or a moon