Set 6 Unit 6.5 Space Systems Part 1 20 Correctly Answered Questions Latest Update

hydrogen {Ans: Is the lightest of all gases, occurring chiefly in combination with oxygen in water.}star {Ans: A giant ball of hot gas, mainly composed of hydrogen and helium.}axis {Ans: An imaginary line through a body, about which it rotates.}luminosity {Ans: Energy output from the surface of a star per second; measured in watts.}solar system {Ans: a cluster of stars, planets, and all the other objects that revolve around the sun}gravity {Ans: the force of attraction between all masses in the universe}revolution {Ans: Earth's yearlong elliptical orbit around the sun}astrophysicists {Ans: scientists who study the universe}spiral galaxy {Ans: A galaxy with a bulge in the center and very distinctive spiral arms. Our Milky Way is an example of this.}Big Bang Theory {Ans: A theory that proposes the universe began as a single point and has been expanding ever since.}International Space Station ISS {Ans: Permanent human presence outside earth - combined five space agencies - US, USSR, European, Japanese, Canada - teamwork through science}light year {Ans: Distance light travels in one year.}rotation {Ans: The spinning of Earth on its axis}scattering {Ans: an interaction of light with matter