science final
What is an astronomical unit
a measuring unit of the distance from the earth to the shb
What is orbit
the path that a object is in surrounding a object being pulled by gravity
what is nuclear fusion
when two or more atomic nuclei combine to form a heavier nuclei
what is a light year
a unit of distance that measures how far livht travels in a vacuum in one year
what is a universe
everythinf in space all matter energy and time
what is a galaxy
a massive collectiok of star dust gas ahd dark natter held together by gravity
what is a satelite
an object that orbits a planet either man made or natural
what is a planet
a body that orbits a dtar and has wnough mass to be spherical
what is a revolution
the term for a object maiing a full spin around the object they orbit
what is rotation
the spinning motion of an object around its own axis
what is the difference between heliocentric and geocentric
Geocentric is a model that shows esrth at the center of everything and heliocentric is the sun in the middle by
what is the big banf theory
based on the vig vang theory the universe was created from hit and initly debse piubt all all magger and energy expanded from it
what are the planets in order
mercury venus earth mars jupiter saturn uranus neptune
what is earths tilt and what is its purpose
23.5 degrees and it creates seasons
what is the differenc between a comet meteor meteorite neteroid asteroid
the composition and what happens when they enter the atmosphere
what is the length of day determined by the speed the earth spins
the length of time the sun is above the esrth
what determines the length of a year
the time it takes to fully orbit the sun
what shape are the orbits of planets
elliptical or a flattened oval
explaik retrograde motiom
the apparent or actual movement of a an ovject in the opposite directioj of its normal direction