what causes the northern lights
solar wind
___ theory is the explanantion on how the solar system was formed
nebular
what is debris clumping together
accertion
how is distance measured in the universe
light years
____ unit is the distance from earth to the sun
astronomical
the sun is ______ in temperature and luminosity compared to other stars
average
what is a light year
the distance light travles in one year DISTANCE
what is an astronmical unit
distance between earth and the sun
what was the solar system before it became a solar system
a cloud of gas and dust/solar nebula
how did the solar sytem form
shock waves from a supernova caused the collapse of the nebula
how much of the debris went to form the sun
99%, pulled by gravity to the middle of the sun
what happens to the other debris
flattens and forms in an accertion disk, material makes the solar system aka planets
what is a planetesimal
smaller debris parts that begin to come together
what is a proto planet
beginning stages of a planet, forms from many planetesimals put together
what should I be able to describe about stars
color, heat, size, brightness, life cycle
what is a solar prominence
streched out parts in large circles that stay in the suns magnetic field and can last from days to years
what is a solar flare
burst of electromagnetic raditation from the suns surface
what are sun spots
areas of the sun that appear dark, indicate location of high magnetic activity
what happened as matter began to clump together in teh nebula
the material started to collapse and become a spinning disk
what is an accretion disc? how does it form
flattened spinning nebula, gravity pulls in the debris
what happened at the center of the accretion disc that led to the formation of the sun
gravity compressed gas and dust, temperature and pressure rose and it became a dense protostar
how did protoplanets become planets
collided with other protoplanets and planetesimals
how old is the earth
4.54 billion years old
how old is the solar system
4.603
