Astronomy - Quiz 8

A gas particle will escape a planet's atmosphere if it moves faster than the

"escape speed"

If the peak wavelength of a star at rest is 1375 nm, then what peak wavelength is observed when the star is traveling 975,000 m/s away from the Earth.

1,379.47

The gas in the solar nebula began at a temperature of about

2000 K

If we could capture the spectrum of an exoplanet, we may find evidence for life on that planet in the form of

biosignatures

A planet will keep a large atmosphere if it _________ or __________.

is cold .... has a ton of gravity

The Jovian planets are composed mostly of _______ and _________.

hydrogen .... helium

Jupiter weighs roughly

twice as much as all the other planets combined

If the peak wavelength of a star at rest is 830 nm, but astronomers on earth observer that is has been shifted by 3.2 nm. Then how fast is the star moving relative to the earth?

1,156,626.51

Why do some astronomers object to the new definition of a planet that was adopted in 2006?

By this definition, Earth, Jupiter, and other planets should not be considered planets.

Which of the following planets in our solar system have rings? (Select all that apply)

Saturn Uranus Neptune Jupiter

An explosion the size of the Tunguska Event is likely to happen every

few centuries

Almost the entirety of Jupiter's size is made up of

gas

What two factors influence whether gas particles stay or leave a planet's atmosphere?

gravity and heat

"More money is spent on making movies about ____________ than on actually finding them."

killer asteroids

The planets closest to the Sun are known as the

terrestrial planets