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AroraScience Unit 2
This is study stacks for the unit 2 science test
| Question | Answer |
|---|---|
| Universe | Everything in, on and around the Earth |
| Space | Empty part of the Universe that doesn't contain any matter |
| Galaxy | A group of Solar systems, dust, and gas held together by gravity |
| Solar System | A system of objects that orbit a star |
| Star | Giant ball of gas that gives off heat, light, and other radiation in outer space. |
| Terrestrial Planet | Similar size and composition to Earth |
| Meteorite | When meteor lands on Earth's surface |
| Meteor | Also called shooting star. Meteoroid comes into Earth's atmosphere and vaporizes. |
| Asteroid | Small and rocky, orbits the Sun. Smaller than planets, larger than meteoroids. Most are in Asteroid belt. they are irregularly shshaped |
| Comet | Made of ice and dust and orbits the Sun. Most are in oort cloud, and the rest are in Kuiper belt |
| Meteoroid | Smaller pieces broken from Asteroids or comets. |
| Outer planets | Giant planets with thick outer layers of gas, dozens of moons with variety of compositions. Mostly made of Hydrogen, helium, and has encircling rings. |
| Nebula | A large cloud of dust and gas in space where stars are born or explode (Plural of Nebula is Nebulae) |
| Super Nova | When stars the size of the Sun explode |
| Order of solar system | sun, mercury, Venus, earth, mars, asteroid belt, Jupiter, Saturn, Uranus, Neptune, Kuiper belt |
| mass of objects increase, force of gravity.... | increase |
| distance between objects increase, force of gravity between them........ | decrease |
| nearest galaxy to milky way | andromeda |
| dwarf planets | Pluto, Ceres, makemake |
| brightest star in the sky | ceres |
| model used for the formation of solar system | nebular model |
| large collection of gas and dust | nebula |
| sun is made up of what percent of our solar system's mass? | 99.8% |
| Meteoroid, star, galaxy, planet, moon asteroid, universe (largest to smallest) | Universe, galaxy, star, planet, moon, asteroid, meteoroid |
| Light year | the distance light travels in one year |
| Spiral galaxy | old stars, spiral arms, gas, dust, and many new stars in spiral arms |
| Elliptical Galaxy | old stars, bright centers with little extra gas and dust. Blob of stars, spherical, or more stretched out |
| Irregular Galaxy | Irregular shape, formed sometimes from collision of 2 or more galaxies, mostly gas and dust, lots of new star formation |
| Stages of life cycle for massive star | Nebula -- protostar -- supergiant -- supernova -- neutron star supernova -- black hole |
Created by:
jaina11
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