1 SCIENCE chpt 34 celestial objects

celestial objects

any natural body beyond the earth's atmosphere

path

a celestial object follows a path that is an orbit e.g. the earth orbits the sun

space

an empty region between celestial objects

moons

a moon is a celestial object that orbits a planet

asteroids

a small lump of rock that orbit around the sun

nucleus

the centre of the comet made up of dust and ice

comets

a small lump of ice and dust that orbit the sun

coma

the fuzzy layer around the nucleus

tail

made up of gas and dust produced by the nucleus

stars

a celestial object that emits light

stars composed

hydrogen and small amounts of helium and other elements held by gravity

stars energy

nuclear energy

planets

orbit a star, enough mass to be a round shape and reflects light from the sun

solar system

comprises of a star and the celestial objects that surround it

gravity

holds the universe together

galaxies

a system of billions of stars

earth's galaxy

milky way

other galaxies

astronomers have discovered billions of galaxies

note

an asteroid belt lies between the orbits of mars and jupiter