Glossary of Solar System
Glossary of Solar System:
atmosphere : layer of goses surrounding a planet
axis : an imaginary line which passes through a planet from the North to the South Pole
core : the central part of a planet
crater : a hollow resulting from the collision of an object with a planet
dwarf star : a smaller-sized star (our Sun is a yellow dwarf star)
elliptical : the shape of an oval
gamma rays : high-energy waves that come from a radioactive source
gravity : the force that attracts all bodies in the Universe to each other
greenhouse effect : the heating that occurs when gases trap heat and stop it from escaping a planet's atmosphere
hemisphere : one half of a planet
Kuipcr Belt : disk-shaped region of minor planets and ice outside the orbit of Neptune
mass : the amount of matter in an object
meteorite : piece of metal or stone from outer spoce that has reached Earth
nuclear reaction : collision of atoms giving off energy
orbit : the path that on object makes around another object
proximity : closeness between two objects
radiates : giving off heat or light
radiation : the release of energy in the form of waves or rays
revolution : the movement of a heavenly body in an orbit around another heavenly body
rotation : turning round ond round like o wheel
satellite : an object that revolves around o planet
sulphuric acid : a strong mineral acid
ultraviolet : invisible rays in sunlight
waning : getting smoller
water ice : water frozen in the solid state
waxing : getting bigger
