Create an account
The terrestrial planets have relatively high densities, solid surfaces, and weak magnetic fields.
How many minor planets are known to exist in the solar system, using today's classification system?
The Jovian planets are composed of mainly hydrogen and helium, have no solid surfaces, and all have rings.
The terrestrial planets and the Jovian planets are distinguished from each other in terms of
density, size, and temperature.
The flattened, rotating disk of gas and dust around the protosun, from which planets were believed to have formed, is called the
At present, the formation of the solar system is believed by most astronomers to have begun with a large, swirling volume of cold gas and dust called the __________ nebula.
Other planetary systems are best detected by the Doppler shifts that change the pattern of the star's __________.
The solar system is a complex system of moving masses held together by ______________ forces.
Kepler's first law states that Earth's orbit around the Sun takes the shape of a(n) ____________.
The distance between the Earth and the Sun is 93,000,000 miles, or one _____________.
astronomical unit (AU)
Kepler's second law of planetary motion gives a relationship concerning equal _________ in equal periods of time.
When a planet has the same meridian as a star, the planet is said to be in _____________.
The fraction of incident sunlight reflected by a celestial body is called its ______________.
_______________ is the apparent motion that occurs between two fixed objects when the observer changes position.
The apparent displacement in the direction of light coming from a star because of Earth's orbital motion is called the ________________.
Aberration of starlight
Proof that the Earth revolves around the Sun is obtained by the use of ________________ and the _________________.
parallax; aberration of starlight
Which is the second largest moon in the solar system and what planet does it belong to?
The moon revolves about Earth from west to east, has a day equal to 29.5 Earth days, and has an elliptical orbit about the Earth.
The Moon revolves around the Earth in a _______ direction, as viewed from above Earth's North Pole.
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together