Astrnomy Flashcards
(21 cards)
Axis
An imaginary line running through the centre of the Earth from north to south about which the Earth rotates
Eclipse
An eclipse occurs when a body in space blocks the light of the sun for a short while.
Far side
The far side of the moon. It is never seen from Earth because the moon takes about the same time to spin around once as it does to orbit the earth
Full moon
The view of the moon seen from the Earth when the whole of its near side is in sunlight
Galaxy
A very large group of stars held together as a system by gravity
Gravitational attraction
An attraction that exists between any two bodies in the universe that have mass
Gravity
The force of attraction that exists between any two bodies in the universe that have mass
Lunar eclipse
When the Earth passes between the sun and the moon
Mass
The quantity of matter in an object (often measured in kilograms).
Near side
The near side of the moon which is the side we always see form Earth
New Moon
A phase of the moon that occurs when the part facing the Earth is facing away from the sun.
Penumbra
The lighter part of a shadow
Phases of the moon
Eight different shapes the moon seems to have(when viewed from Earth) while it completes one orbit of the Earth
Revolution
One complete orbit of a body around another body
Revolves
What a body (e.g. the Moon) does when it moves right around, or orbits, another body (e.g. the Earth and Sun).
Rotation
One complete turn by a body around its imaginary axis. Such a body (e.g. the Earth) is said to rotate on its axis
Season
One of four equal periods into which a year is, resulting from the apparent movement of the sun north and south of the equator during a he courageous of the earth’s orbit around it.
Solar eclipse
A solar eclipse occurs when the moon passes between the sun and earth
Umbra
The darker central part of a shadow
Orbit
The movement of an object following a curved path around another object. For example, the Moon orbits the Earth
Heliocentric
A model of the solar system where the Sun is at the centre