Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
14 Cards in this Set
- Front
- Back
|
Day
|
The time it takes for a planet to rotate on its axis (24 hours on Earth)
|
|
|
Year
|
The time taken by a planet to complete one orbit around a star.
|
|
|
Season
|
A period during the year where the weather and day length is determined by the tilt of the Earth and its stage of orbit around the Sun.
|
|
|
Terrestrial planets
|
The inner solar system planets: Mercury, Venus, Earth, Mars, composed of rocky materials.
|
|
|
Gas giants
|
Planets that are comprised of mainly gas (Jupiter, Saturn, Uranus, Neptune).
|
|
|
Orbit
|
One complete circuit around a celestial body.
|
|
|
Satellite
|
A celestial object that orbits the Sun or a planet (Artificial ones may orbit the Earth, the moon or a planet).
|
|
|
Planet
|
A large object that orbits a star.
|
|
|
Solar eclipse
|
When the Moon passes between the Sun and Earth and prevents the Sun’s light reaching Earth.
|
|
|
Lunar eclipse
|
When Earth passes between the Sun and the Moon and cuts off the Sun’s light to the Moon.
|
|
|
Solar system
|
The system that includes the Sun plus all the celestial objects which are in the Sun’s gravitational field.
|
|
|
Moon
|
A natural satellite that orbits a planet.
|
|
|
Light year
|
The distance that light travels in 1 year.
|
|
|
Galaxy
|
A distinct collection of billions of stars held together by the force of gravity.
|
