The outer atmosphere of the sun. A thin, extremely hot plasma over 1,000,000 deg. Celsius compared to around 6,000 deg. Celsius for the visible surface

An attractive force that acts between all matter, has mass, and is proportional to that mass

Two regions of a planet at the extremities of its rotational axis

A celestial body that revolves around a planet

Imaginary line through Earth that extends from the N. Pole to the S. Pole and is the center for Earth's rotation

The shape of the illuminated portion of the moon as seen by an observer; usually on Earth

An obscuring from the light of a celestial body by the passage of an object bet/ the celestial body and the observer or bet/ the celestial body and its source of illumination

The 4 natural divisions of the year based on changes in temperature due to the varied amounts of sunlight (both intensity and daylight hours received); caused by the tilt of the earth during revolution

The slant of Earth's axis which is 23.5 degrees from vertical compared to Earth's orbital plane around the sun; as a result the North Pole always points to the North Star

A curved path followed by a satellite as it revolves around an object

The branch of science that studies the physical universe beyond Earth's atmosphere

A phenomenon or process that involves multiple steps and repeats itself

The full moon passes into Earth's shadow causing the moon to appear reddish in color when the sun, Earth, and moon directly line up; lasts for 1 - 3 1/2 hours