astronomy Flashcards
what is astronomical unit
astronomical unit is the distance from the center of the earth to the center of the sun
how does a comet look like and what is a comet
a nuclear object that is mostly ice and dust also when its near the sun it’s dust particle shine in the sun
what type of planets are mostly made of gas also why is it called the giant gas planet
juipiter, saturn,Uranus, and Neptune
what is a parsec
parsec is the unit of distance used in astronomy, equal to about 3.25 light years
who is a Cosmologist and what do they do
astronomer that studies evolution and space-time relations throught out the universe
what are protoplanetary made of
protoplanetary are the size of the moon and is also and can also create a planet by having gas, dust, and rock
what is planetesimal aka and what is it
planetesimal is aka the minite planet and its when a body that did or already did come together to form a new planet
Nuclear Fusion
when a low atomic numer fuse to from a heavier nucleus with a release of energy
what is a nebula
nebula is a cloud of dust in outer space
what does orbit mean
orbit means to move around the sun
what is period
a lenght of time
how does the earth revolve around the sun and moon
the earth revolve around the sun and moon in a circle
how does rotation work
it works by rotating around the axis and the center of the sun
what is sidereal day
the time taken by the earth to rotate on its axis relative to the stars
what is a angular velocity
the rate of change of angular position of a rotating body usally express in radian
light year is the distance of light travel how long does it take
it takes about one year for a light year to travel
how are constellation form
a group of star forming a pattern that is named after mythology creatures and is in the night sky
what is a terrestrial planet
a planet with a rocky surface just like earth
what are astoids
a small rockey bodie orbitting around the sun
