term 4 Flashcards
earth
the only planet that can sustain life due to its position in the solar system
why is the sun a star
because it produces its own light through the fusion of hydrogen gas to form helium gas
luminous objects
emits it’s own light
if an object has a specific colour
the object is “that colour”. white light hits the surface. all colours are absorbed by the surface except for “that colour” that is reflected toward the eye
the law of reflection
the angle of incidence is equal to angle of reflection
origin of the name milky way (khoisan)
a girl threw ash into the sky to help a hunter find his way home and later she created stars by throwing inedible old carrots into the sky
how do xhosas see the milky way
straight hair behind the sky
conditions that support life on earth
atmosphere that contains oxygen
temperature range
water in all 3 phases
sun is there for photosynthesis
mercury
closet to the sun. thin atmosphere so cant retain the heat so it’s freezing
closest to star to earth is
the sun 8 light minutes
a light year is
the distance travelled by light in a year
optical telescopes m
received light and focus it by refraction (using lenses) or reflection (using mirrors)
radio telescope
receive radio waves and focus them by reflection
space telescopes
hubble space was taken into space by the spaceship discovery in 1990
asteroid
one of many rocks found in space mostly between the orbits of mars and jupiter
