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34 Cards in this Set

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Astronomy

The study of celestial objects, space, and the physical universe as a whole.

The study of celestial objects, space, and the physical universe as a whole.



Seasons

The four divisions of the year (spring, summer, autumn, and winter)

The four divisions of the year (spring, summer, autumn, and winter)



Equinox

The time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of equal length

The time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of equal length



Solstice

Either of the two times in the year, the summer solstice and the winter solstice, when the sun reaches its highest or lowest point in the sky at noon

Either of the two times in the year, the summer solstice and the winter solstice, when the sun reaches its highest or lowest point in the sky at noon



Tides

Alternate rising and falling of the sea, usually twice in each lunar day at a particular place, due to the attraction of the moon and sun.

Alternate rising and falling of the sea, usually twice in each lunar day at a particular place, due to the attraction of the moon and sun.



Neap tide

A tide just after the first or third quarters of the moon when there is the least difference between high and low water.

A tide just after the first or third quarters of the moon when there is the least difference between high and low water.



Spring tide

A tide just after a new or full moon, when there is the greatest difference between high and low water.

A tide just after a new or full moon, when there is the greatest difference between high and low water.



Phases of the moon

As the moon circles the Earth, the shape of the moon appears to change; this is because different amounts of the illuminated part of the moon are facing us.

As the moon circles the Earth, the shape of the moon appears to change; this is because different amounts of the illuminated part of the moon are facing us.


Waxing

When you see the moon as a slim crescent - in the west after sunset - it's a waxing moon

When you see the moon as a slim crescent - in the west after sunset - it's a waxing moon



Waning

Waning Moon means the moon is decreasing in size, moving from the Full Moon towards the New Moon.

Waning Moon means the moon is decreasing in size, moving from the Full Moon towards the New Moon.


Gibbous

Convex at both edges, as the moon when more than half full.

Convex at both edges, as the moon when more than half full.



Crescent

A crescent moon is part way between a half moon and a new moon, or between a new moon and a half moon.

A crescent moon is part way between a half moon and a new moon, or between a new moon and a half moon.



Solar eclipse

An eclipse in which the sun is obscured by the moon.

An eclipse in which the sun is obscured by the moon.



Lunar eclipse

Aan eclipse in which the moon appears darkened as it passes into the earth's shadow.

Aan eclipse in which the moon appears darkened as it passes into the earth's shadow.



Rotation

The action of rotating around an axis or center.

The action of rotating around an axis or center.

Revolution

An instance of revolving.

An instance of revolving.



Axis

an imaginary line about which a body rotates.

an imaginary line about which a body rotates.



Gravitational force

Forces of attraction.  It's like the Earth pulling on you and keeping you on the ground. That pull is gravity at work.

Forces of attraction. It's like the Earth pulling on you and keeping you on the ground. That pull is gravity at work.



satellite

An artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication.

An artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication.



Debris

Space debris, also known as orbital debris, space junk and space waste, is the collection of defunct objects in orbit around Earth.

Space debris, also known as orbital debris, space junk and space waste, is the collection of defunct objects in orbit around Earth.



Astroid

A small rocky body orbiting the sun.

A small rocky body orbiting the sun.



Planet

A celestial body moving in an elliptical orbit around a star.

A celestial body moving in an elliptical orbit around a star.



Atmosphere

The envelope of gases surrounding the earth or another planet.

The envelope of gases surrounding the earth or another planet.



Astronomical unit

A unit of measurement equal to 149.6 million kilometers, the mean distance from the center of the earth to the center of the sun.

A unit of measurement equal to 149.6 million kilometers, the mean distance from the center of the earth to the center of the sun.



Gas giants

A large planet of relatively low density consisting predominantly of hydrogen and helium, such as Jupiter, Saturn, Uranus, or Neptune.

A large planet of relatively low density consisting predominantly of hydrogen and helium, such as Jupiter, Saturn, Uranus, or Neptune.



terrestrial planets

 The inner planets closest to the Sun.

The inner planets closest to the Sun.



Meteors

A meteor is the flash of light that we see in the night sky when a small chunk of interplanetary debris burns up as it passes through our atmosphere. "

A meteor is the flash of light that we see in the night sky when a small chunk of interplanetary debris burns up as it passes through our atmosphere. "



Comets

A celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun.

A celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun.



International Space Station

The International Space Station is a large spacecraft. It orbits around Earth. It is a home where astronauts live.

The International Space Station is a large spacecraft. It orbits around Earth. It is a home where astronauts live.



NASA

The National Aeronautics and Space Administration (NASA) is the United States government agency responsible for the civilian space program as well as aeronautics and aerospace research.

The National Aeronautics and Space Administration (NASA) is the United States government agency responsible for the civilian space program as well as aeronautics and aerospace research.



Hubble telescope

The Hubble Space Telescope is a large telescope in space.

The Hubble Space Telescope is a large telescope in space.



Space probes

An unmanned exploratory spacecraft designed to transmit information about its environment.

An unmanned exploratory spacecraft designed to transmit information about its environment.



galaxies

A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.

A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.



Solar system

The collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.

The collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.