Show:
Stars 1
stars 2
stars 3
stars 4
stars 5
100
The sun is classified as a __________
star
100
What is parallax?
The apparent change in position of an object when viewed from different place.
100
What color are the "cooler stars"
reddish
100
How does a star form from a nebula? Explain in detail.
Gravity pulls the gas and dust together forming a protostar, when the contracting dust becomes dense and not nuclear fusion begins and a star is formed.
100
What is a neutron star? What does it result from
remains of high mass stars from the explosion
200
Name three characteristics to classify stars
color temperature size mass composition brightness
200
Star Destiny is 25 light years away from Earth and Star Kristen is 37 light years away from Earth. Which star would have a greater parallax and why?
Star Destiny, because the closer a star is to Earth, the more it appears to move
200
Star Catalina is a "cooler star" (reddish) but has a very high absolute brightness. What can you infer about Star Catalina?
It is very big
200
What is a protostar?
early stage of life of a star before nuclear fusion begins.
200
Why do some stars become white dwarfs and others neutron stars or black holes.
depends on the mass of star
300
What is the difference between apparent brightness and absolute brightness.
Apparent: How bright a star appears to be as seen from Earth Absolute: The brightness a star would have if it were at a standard distance to Earth
300
What two charactersitics are shown IN An H-R diagram?
Surface temperature of a star and absolute brightness.
300
Fill in the blanks In general Hotter stars have a _________ brightness In general Bigger stars have a __________ brightness
high high
300
What factor determines how long a star lives?
mass
300
What is a black hole? What does it result from?
intense body of gravity, a supernova exploding star
400
Star Dibrita and Star Brito appear to have the same brightness. Star Brito is farther away. Which star has more absolute brightness and explain why.
Star Brito, if they appear to have the same brightness and Brito is farther away, it would have a more absolute brightness.
400
What are two ways astronomers can use an H-R diagram for?
To classify stars understand how stars change over time
400
Star Nikhil is a very HOT star and has a blue color, however does now have the highest absolute brightness. What can you infer about Star Nikhil?
small star
400
Why do bigger stars live shorter lives than smaller stars?
They burn their fuel faster.
400
What is a galaxy? Explain 3 types of galaxies
cluster of stars, gas, and dust bound together by gravity Spiral: bulge in center arms spiral outwards, young bright stars on arms with ga and dust, older stars in center-little gas and dust Elliptical: flattened ball of stars, older stars, little gas and dust Irregular: Random pattern, bright young stars, gas and dust
500
What is a light year?
The distance light travels through space in one year.
500
What color are the hottest stars
blue
500
What is a nebula?
a cloud of gas and dust with great volume
500
What is a white dwarf and what type of star does it result from?
the blue-white core from a red giant, results from alow mass star.
500
What is the big bang theory? Explain the evidence that supports it
hot, dense, gas exploded in an instant 1) moving galaxies shows universe is expanding 2) cosmic background radiation: radioactive remains support an explosion occurred.