gravity
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The pressure that attractive one thing to another. Heaviness holds galaxies together and it holds planets, moons, and spacecraft in orbit. It also holds girlfriend on the ground.

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light-yearThe street that irradiate travels in one year. One light-year equals about 6 trillion miles or 10 sunshine km.
universeEverything the exists – every the galaxies, black color holes, stars, nebulas, moons, planets, comets, asteroids, meteoroids, and also dust scattered through space. This consists of you!
galaxyA arsenal of millions or billions that stars plus numerous gas and also dust, hosted together by gravity. There are spiral, elliptical, and irregular species of galaxies.
Milky WayThe galaxy that contains our solar system and all the stars you can see in the night sky with the nude eye. Also, the easy glowing tape of light made from faint stars, that arcs across the night sky.
solar systemA star (or group of stars) and the planets, moons, comets, and asteroids that orbit the (them).
starA huge ball that hydrogen gas the produces light and also heat by method of a atom reaction (fusion) in that core.
SunThe star in ~ the center of ours solar system. That is a large ball of warm gas, mostly hydrogen (92.1%) and helium (7.8%). In that is core, incredibly high temperatures and pressure fuse hydrogen into helium. This nuclear fusion releases power that progressively travels come the surface and also makes the sun shine.
sun spotsTemporary locations of focused magnetic areas on the Sun. In these areas, the sunlight is cooler and darker than various other regions of the Sun.
geomagnetic stormsDisturbances in the geomagnetic ar caused by gusts in the solar wind the blows through Earth.
solar radiation stormsElevated levels of radiation that take place when the number of energetic particles increase.
radio blackoutsDisturbances of the ionosphere caused by X-ray emissions from the Sun.
planetA huge object the orbits a star. Planets bright by reflecting sunlight – they carry out not produce their very own light like a star does.
rocky planetA world that is made mainly of rock. These are sometimes called terrestrial planets. In ours solar system, Mercury, Venus, Earth, and also Mars are rocky planets.
gas giantA big planet made up primarily the hydrogen. In ours solar system, Jupiter, Saturn, Neptune, and also Uranus room gas giants.
yearThe time it takes a planet to orbit the Sun.
orbitThe course of an item around an additional object. (Examples: the course a earth takes about the sun; the path a moon takes around a planet; the path asteroids or comets take roughly the sun.)
rotationThe turn of a planet, moon, or star on its axis.
axisThe imaginary line v the facility of a planet, moon, star, or galaxy approximately which it rotates.
sidereal dayThe time the takes a planet or moon to do one complete turn top top its axis.
solar dayThe time that takes a world or moon native one noon to the next moon.
moonA herbal object orbiting a planet. Also called a natural satellite.
asteroidA small rocky or metallic object orbiting the Sun, sometimes called a young planet. Most asteroids in ours solar mechanism orbit in the main asteroid belt in between Mars and Jupiter.
Kuiper BeltA an ar beyond the orbit that Neptune wherein multitudes of icy comets orbit the sun.
comet– A tiny body make of ices and dust that orbits the sunlight on an elongated path. When close to the Sun, the ices prosper warm, and the comet develops a huge coma and also streams off lengthy tails that dust and gas.
comaThe gaseous environment that surrounds the icy nucleus of a comet. It forms as the comet’s ices evaporate in the warm of sunlight and also can be countless miles wide.
Oord CloudA swarm the trillions of comets believed to prolong from the Kuiper Belt out approximately halfway to the nearest star, or around 2 light-years.
meteorThe bright streak the light produced by a bit of space debris burning up as it enters the atmosphere at high speed. Meteors are also called shooting stars.
meteoriteA item of heavy debris that lands on the surface ar of a earth or moon. It may be stony or metallic or a mixture of the two. Many are pieces broken off native asteroids.
meteoroidAny little debris traveling v space. Larger meteoroids room usually piece of wrong asteroids. Smaller meteoroids are largely dust particles shed by comets.
meteor showerA big number the meteors that show up to come from one small area of sky. A meteor shower wake up when earth runs into the debris thrown turn off by a comet. Meteor showers are named for the constellation from which they appear to come.
craterA dish- or bowl-shaped depression in the surface ar of a planet, moon, or asteroid. Many are geological scars led to by the high-speed influence of a meteorite.
atmosphereA layer of gas neighboring a planet, moon, or star.
astronautA human being trained for spaceflight.
astronomyThe scientific study the the universe, including the solar system, stars, and also galaxies.
astronomerOne who studies the universe, including the solar system, stars, and also galaxies.
new moonMoon in which none of the side we watch is lit up.
full moonA moon in i beg your pardon the next we view is every lit up.
waningA moon in i beg your pardon the amount lit increase gets less each night.
waxingA moon in i beg your pardon the amount lit up gets much more each night.
cresent moonA moon with much less than fifty percent of the side we view lit up.
gibbous moonA moon with an ext than fifty percent of the side we check out lit up.
quarter moonA moon with exactly half of the next we see lit up.
first quarter moonA 4 minutes 1 moon when the moon is waxing.
third 4 minutes 1 moonA quarter moon once the moon is waning.
MercuryThe first planet indigenous the Sun.
VenusThe 2nd planet native the Sun.
EarthThe third planet indigenous the Sun.
MarsThe fourth planet indigenous the Sun.
JupiterThe 5th planet from the Sun.
SaturnThe sixth world from the Sun.
UranusThe seventh planet from the Sun.
NeptuneThe eighth planet from the Sun.
PlutoThe 9th planet from the Sun.

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Planet XThe tenth planet from the Sun.
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