space chapter 7

• an object in outer space
• stars, planets, moons are some

• a scientist that professionally travels into space
• eg. chris hadfield

• a complete turn around a star or planet by a smaller celestial object
• eg. earth revolution=365.24 days

• a complete spin of a celestial body on its axis
• eg. earth's rotation=24 hours

• a group of unrelated stars that form a design
• none are perfect
• 

• how far light travels in a year
• equal to 9.5*10^5 km
• used to measure distances in space

how bright a star is from earth

• a small group of stars within constellations
• eg. the big dipper
• 

the stars at the far end of the big dipper that point to polaris on a 5 to 1 ratio

• stars visible all year long
• eg. polaris

look straight up for this constellation

• caused by stretching of earth by moon
• not moon's gravity

• the positions at which the moon is seen
• eg. new moon, waxing crescent
• 

• when the moon totally covers the sun
• can be partial
• don't look at it

• when you can no longer see the moon in earth's shadow
• the one you're more likely to see

do to earth's tilt, sometimes different parts of the earth recieve different amounts of sunlight

• a body of circular matter that emits no energy on its own
• inner planets are rocky
• outer planets are gassy

• the sun and everything that revolves around it
• includes oort cloud and kuiper belt

when the planets do weird things in the sky because we are on a different orbit

• 149 597 871 kilometers
• used to measure space stuff
• the distance between the sun and earth

• how large an orbit's radius is
• measured in AU

• earth is centre of solar system
• believed to be true until recently (a few hundred years)

• sun is at centre
• common model today
• everything orbits around sun

• flying ice particle with other stuff that leaves a con trail
• has weird orbit
• named after discoverer

• small planet-like object without any form of atmosphere
• basically a space rock

• space rock that isn't orbiting anything
• potential meteor
• tiny

• a meteroid when it enters earths atmosphere
• potential end of world

meteor after falling through earth

an object past neptune's orbit