earth science 25. Flashcards
are stars in contellations actually close to each other
no they just seem that way from our point of view.
how many constellations are there
88
what is important about the big and little dipper.
the big dipper points to polaris
what is polaris
it is directly in the north so if your lost you can just look for it
why does it look like the stars are moving around in the sky
earths rotation makes it look like that
how long does it take the sun to get to the other side of the earth
6 months
How much would we see stars that are near the equator
only sometimes
what are the stars called that we can see them all the time
circumpolar
what is the equivalent of lines of latitude on those globes
declination
how many times would we see stars in the south
never
why are their 24 numbers going around the globe
becuase it takes the earth 24 hours to rotate
what are the vertical lines on that globe
right ascensions
what are the differneces between stars that we can see
their size color and temperature,and elements that make them up.
name the color of stars from hot to hottest
red yellow then blue the hottest
what are binary stars
when two stars rotate around each other
what is the name of a triple star
proxima centuri
what does mass say about the wobble of binary stars
the more mass one has than the other star the more wobble it has, But if the stars are equal mass there is less wobble.
what is an eclipsing binary star
when one star is bright the other is relatively dim. When they are matched there is less light but when they are side by side there is more.
what is parallax
it is the apparent shift in position when you look at something one angle to another.
what do we do to notice a stars shift in positon
we wait half a year later because we moved by a lot
what unit do we use to measure distantce for stars
light years
how far is proxima centuri form us
4.2 light years away
how do we determine the differnece in brightnes for stars
apparent and absolute
what do we call it when a star has a certain amount of brightness
absolute brightness
what makes the light in a star
the photosphere
what is apparent brightness
when the star is far away so it looks dimmer than it actually is
is brightness a negative or positive number? which is brighter negative or positive
a negative. the more negative a star is the brighter it is.
what distance to scientists use to measure absolute magnatude
32.6 light years
the hotter a star is what changes
it gets bigger and the hotter changes to blue and brighter
what is the verse we used in class to talk about God creating less light and greater ones
Genisis 1:16
what is a nebula
all the gas and dust in space
what would happen if a shockwave hit a nebula? what would form
they would start contracting and pulling together. a protostar after more gravity is gathered.
what is one of the nebulas we can see with the naked eye
orion nebula
what keeps stuff from going out and collapsing when a star is formed
gravity, and gas pressure from nuclear fusion
what is a main sequence star
has balance of gravity and gas pressure thanks to nuclear fusion
what fuel is being used up when a star cant go on anymore. explain the sequence.
hydrogen. It keeps on expanding becoming a red giant and if it expands a lot if become s super giant. then it becomes cooler. and maybe even it explodes
low mas stars sequence
nebula, protostar, main sequence star, white dwarf, and black dwarf
medium mass stars sequence
after main sequence star, red giant, planetary nebula, white dwarf, and black dwarf
massive stars sequence
after main sequence star, red supergiant, supernova explosion, neutron star or black hole
what makes a massive star black hole or neutron star
if it’s extremely big its black and if it’s somewhat big it’s a neutron star.
what does a neutron star shoot out
radio waves
what are pulsars
neutrons stars the radiate radio waves
why cant you see a black hole
because nothing can escape the gravity
what galaxy are we in
milky way and barred spiral
where are we located
2/3 of the way out in the mm galaxy
how big is the mm galaxy
100,000 light years across, and 10,000 for width
do you elliptical have old or young star
young with difromed one
what is a cluster
a group of galaxies
what is a really big group of galaxies
supercluster
what is an even bigger group of galaxies
filaments
