note cards

Aphelion
The point that is farthest from the sun in the orbit of a planet or
comet.
Asteroids
A small, rocky body that can range in size from 100km to less than 1km.
Barycenter
The center of mass or the balancing point between two objects.
Big Bang Theory
The theory that proposes that the universe originated as a single mass, which subsequently exploded and has been expanding ever since
Comets
A small body made of rocky and metallic pieces held together by frozen gases, they move around the sun in elongated orbits.
Doppler Effect
The apparent change in frequency of electromagnetic or sound waves caused by the relative motions of the source and the observer.
Equinox
The time during which the Earth is in its spring and fall and is closest to the sun.
Galaxy
A system of multiple stars and the objects that orbit them.
International Date Line
An imaginary line in the Pacific Ocean that marks the change of the calendar day.
Lunar Eclipse
When the Earth moves directly in line between the Sun and the moon.
Meteor
The luminous phenomenon observed when an object enters Earth’s atmosphere and burns up
Meteorite
A mass of stone or metal that has fallen from space and has reached Earth’s surface.
Nebular Hypothesis
The idea that the solar system formed as a spinning cloud of dust and gases.
Nutation
The periodic oscillation of the precessional axis of the Earth. This can change the angle of the Earth’s axis by half a degree.
Perihelion
The point in the orbit of a planet where it is closest to the sun
Precession
he complex motion of a rotating body that resembles the spinning of a top. This type of motion is demonstrated by the Earth’s 23. Degree angle of its axis.
Prominence
Huge cloudlike structures consisting of chromospheric gases. These often appear as arches that extend out into the atmosphere of the sun.
Revolution
The motion of one body around another, as Earth goes around the Sun.
Rotation
When the Earth makes one full rotation around its axis. This causes night and day.
Solar Eclipse
When the moon moves directly in line between the Earth and the Sun.
Solar Flare
A sudden and tremendous eruption in the solar chromosphere. This release a lot and many different types of electromagnetic waves.
Solar System
Consists of one or more stars and the planets and other bodies that orbit them.
Solstice
Either of two times a year when the sun is furthest from the equator, occurs in winter and summer
star
Any heavenly body that appears as a fixed point at night. Usually there is only one or two per solar system
Sun Spots
A dark spot on the sun, which is cool by contrast to the surrounding photosphere
Univirse
All matter and space in existence, including the Earth and the heavens.