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HEKLP PLZ IM NOT GON
| Question | Answer |
|---|---|
| What keeps objects in orbit | The force of the sun's gravitational pull |
| What determines the strength of gravitational pull? | Gravitational force between any two objects in the solar system depends on their mass and the distance between them |
| What are objects in the solar system measured in? | Astronomical units |
| What is an astronomical unit? | The average distance from the center of the sun to the center of Earth (about 150,000,000 km.) |
| What makes up 99.85 precent of our solar system? | The sun |
| Define planet | Round, orbits the sun, cleared its orbit of any debris |
| Characteristics of an inner planet? | Small, mostly made out of rock or metal |
| Characteristics of outer planets? | Very large, made out of gas and liquid |
| Dwarf Planets | Planets that haven't cleared its area of debris |
| What is a natural satellite | A celestial body in orbit |
| What are asteroids? | Small, mostly rocky, many found in-between mars and Jupiter |
| What are meteoroids? | Chunks of rock or dust smaller than asteriods |
| Comets | loose balls of ice and rock that usually has very long narror orbits |
| What was the universe 4.6 billion years ago? | Hydrogen, helium, rock, ice |
| how was the universe formed | it got condensed by gravity into a cloud and as more and more got pulled in it became hot soup, then sun formed, and then planets formed around sun, starting as planetesimals, then merging into planets |
| Why doesn't inner planets have as much gas as the outer planets? | Their small, rocky , dry, bodies were unable to hold unto gases such as helium and hydrogen (basically size.) |
| What type of energy does all objects in space emit? | electromagnet radiation |
| What do scientists use to detect electromagnet radiation | instruments such as telescopes |
| What is visual light? | A type of electromagnet radiation |
| Telescopes | instruments that collect and focus light and other forms of electromagnet radiation |
| What are the two main types of optical telescopes | Refracting (uses multiple lenses to collect light), and reflecting (uses mirrors to collect light) |
| What do non-optical telescopes do? | Collect different types of electromagnetic radiation. |
| What is a space probe? | spacecraft that carries scientific instruments to collect and transmit data with no human crew |
| What are orbiters | probes that are equipped to photograph and analyze the atmosphere of a planet |
| What are landers | probes that are equipped to land on a planet and analyze the materials on its surface |
| How do scientists determine the distance nearby stars and other objects? | They measure the objects apparent motion, or parallax in the sky as Earth is on the opposite side of its orbit around the sun . |
| What is a binary and multi star system | Group of two or more stars |
| What is an eclipsing Binary Star | When one dim star periodically bock the light of the star it's orbiting |
| What are Globular clusters | A large group of older stars (it looks round and have millions of stars) |
| What is a galaxy | a group of single stars, star systems, star clusters, dust, and gas bound together by gravity. stars circle around a galaxy in millions of years |
| Spiral Galaxies | Appears to have a bulge in the middle, arms that spiral outwards (we are in one) |
| Elliptical Galaxies | Rounded but maybe elongated and slightly flattened. They contain billions of stars and have little gas or dust between them (they only contain old stars because no new ones are forming) |
| Irregular Galaxies | do not have regular shapes. They are smaller than spiral and elliptical and contain young new ones (they also have lots of gas and dust to make more) |
| Quasars | active, young galaxies with black hole at their center. GAs spins around, heats it up, and glows |
Created by:
Voxisthebest