an imaginary line about which a body rotates.

0 degrees latitude

The distance in degrees north or south of the equator

Distance east or west of the prime meridian, measured in degrees

the star positioned directly over Earth's North Pole; also known as Polaris

The path of an object as it revolves around another object in space

Earth's yearly orbit around the Sun

The spinning of Earth on its axis

Earth's tilt in relation to the Sun cause the ____.

The angle at which the sun's light strikes the Earth's surface.

The day when the sun reaches its greatest distance north or south of the equator

The two days of the year on which neither hemisphere is tilted toward or away from the sun

the phase of the moon in which only a curved edge of the moon's side that faced earth is illuminated

phase in which one-half of the Moon's lighted right side can be seen from Earth (1/4 of total moon)

the phase of the moon in which we see the entire moon lighted, and it appears bright and round

Moon phase in which more than half of the Moon appears to be illuminated.

when the moon is between the sun and Earth

the blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon

the progression of changes in the moon's appearance during the month

Occurs when the Moon passes directly between the Sun and Earth and casts a shadow over part of Earth

light is on the left, exactly 1/2 of visible moon is illuminated.

(of the moon) pertaining to the period during which the visible surface of the moon decreases

(of the moon) pertaining to the period during which the visible surface of the moon increases

sun, planets, and all the other objects that revolve around the sun

A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity

All of space and everything in it

the universe

A large cloud of dust and gas in space

the stage in which stars produce energy through the fusion of hydrogen into helium, where stars spend most of the lives

a large cool star

a very large star of high luminosity, and much larger than a Red Giant

A gigantic explosion in which a massive star collapses and throws its outer layers into space

an extremely dense cosmic object that can form after a star becomes a supernova

A huge cloud of gas that is created when the outer layers of a red giant star drift out into space

A contracting cloud of gas and dust; the earliest stage of a star's life

the small, dense remains of a high-mass star after a supernova

the distance light travels in one year

the average distance between the earth and the sun

a gas that absorbs and radiates energy in the atmosphere, trapping thermal energy

All the water at and near the surface of the earth, 97% of which is in oceans

Consists of all life on Earth and all parts of the Earth in which life exists, including land, water, and the atmosphere.

the solid part of the earth consisting of the crust and outer mantle

a layer of gases that surround an object, held in place by gravity

a planet orbiting a star other than our Sun

a tool used to study the spectrum of colors coming from a light source