Question | Answer |
Light Year | distance light travels in one year |
space station | large artificial satellite on which people can live and work for long periods |
phases of moon | different shapes of moon seen from earth that change because of angle looking at moon |
force of gravity | pull from a body that's strength is dependent upon somethings mass and the distance between the objects |
core | center of sun where nuclear fusion occurs |
smallest terrestrial planet | mercury |
largest terrestrial planet | earth |
geocentric | earth centered universe |
heliocentric | sun centered system |
parallax | apparent movement of a star when seen from a different position |
1st Law of Planetary Motion | discovered by Kepler and states that the orbits of planets are an ellipse |
solar wind | stream of electrically charged particles that extend outward from the sun's corona |
refracting telescope | type of telescope that uses convex lenses to gather and focus light |
remote sensing | collection of data from a distance without coming into direct contact |
inner planets that had signs of water | earth and mars |
inner planets | mercury, venus, earth, mars |
rocket stage | engine for rocket that when it runs out of fuel falls off and falls back to earth |
outer planets | jupiter, saturn, uranus, neptune |
characteristics of outer planets | large, made of gases like hydrogen and helium, many moons, rings, far apart |
man made satellite | unmanned spacecraft put into orbit around earth for the primary purpose of observing the earth's surface |
craters | round pits on moon |
revolution | planet's motion around sun, earth's revolution takes about 365 days or one year |
main sequence star | star that increases in brightness as it increases in temperature |