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which planet is considered earth's
sister planet?


Triton is a moon of which planet?


what two planets are most of the asteroids found between?

Mars and Jupiter

hydrogen and helium combine to make up what % of the universe


which components of the solar system have remained unchanged and provide information

asteroids, comets, meteoric material

the material in the innermost core of earth is

hot and solid

the majority of earthquakes occurs

at the boundaries of tectonic plates

the earth's magnetic field is produced by

electric currents deep within the earth's core

how did the moon originate

Ejection of debris from a collision of a planet sized object with the earth and subsequent coalescence into the Moon.

the volcanoes of mars are

massive and extinct

jupiter mostly consists of


the great red spot on jupiter is

a large long lived storm that is maintained by the planets differential rotation

what is the cause of the slightly flattened oblate shape of jupiter

it's rapid rotation

what do Uranus and Neptune look like

blue-green in color, uranus is almost featureless, neptune has dark clones and white clouds

what planets in our solar system have rings around them?

all of the jovian planets

pluto's orbital path

elliptical and tilted

the nucleus of a comet is

an irregular, dirty ice ball

what is the order of the planets from the sun

mercury, venus, earth, mars, jupiter, saturn, uranus, neptune, pluto

interstellar medium

the space between the stars is not empty but filled with low density stars and clouds of dust and gas

interstellar dust

1% of the mass is made up of microscopic dust particles

nebulae is clear evidence of ____

an interstellar medium

3 kinds of nebulae

emission nebulae, reflection nebulae, dark nebulae

emission nebulae

produced where very hot stars excite clouds of low density gas to emit light

reflection nebulae

where slightly cooler stars illuminate gas clouds containing dust; provide evidence that the dust in the clouds is made up of very small particles

dark nebulae

produced where dense clouds of gas and dust are silhouetted against background regions filled with stars or bright nebulae

interstellar reddening

when stars look slightly redder than they should

which 2 planets do not have any moons

mercury and venus

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