A large cloud of gas and dust spread out in an immense volume
100
What are the physical characteristics of stars?
color, temperature, size, composition, and brightness
100
What is the life cycle of a high mass protostar?
nebula-high mass protostar- high mass star-super giant- supernova- neutron star or black hole
100
What is a galaxy?
a huge group of single stars, star systems, star clusters, dust, and gas bound by gravity.
200
How is a protostar formed? What is a protostar?
gravity pulls together gas and dust, and as they contract, they start to heat up. This is enough to form a protostar. The earliest stage of a star's life before nuclear fusion has begun
200
What are stars?
huge spheres of glowing gas that produce energy through the process of nuclear fusion.
200
What is a planetary nebula?
When low mass stars and medium mass stars start to run out of gas, the outer layers expand. They form a glowing cloud of gas called the planetary nebula.
200
What is the range of stars in a galaxy?
Each galaxy has from 1 billion-1 trillion stars
300
What determines a stars lifetime?
It's mass. If it has a large mass, the star will die quickly (10 million years). If a star has a small mass, then it will die slowly (10 billion-200 billion years).
300
What is the order from coldest star to hottest star based on color?
Red, yellow, white. blue
300
After a planetary nebula is completely gone, what is left?
The core of the original star, also called a white dwarf
300
What are quasars?
Extremely far away objects that are like stars and have black holes at the center of them.
400
When does a star "die"?
When it stops going through the proccess of making nuclear fusion and runs out of fuel. The star then either becomes a neutron star or a black hole or a white dwarf
400
What are very large stars called?
super giants or giant stars
400
What is a neutron star? What is a spinning neutron star called?
Neutron stars are the remains of high mass stars. Pulsars are spinning neutron stars that release radiation in narrow cones, like a lighthouse
400
What are the 3 types of galaxies?
Spiral galaxies, Elliptical galaxies, and irregular
500
What is the life cycle of a low mass or medium mass protostar?
nebula-low mass or medium mass protostar-low mass or medium mass star-red giant-planetary nebula-white dwarf
500
What are the 2 smallest types of stars?
White dwarfs and Neutron stars
500
What is a black hole?
A black hole is the most massive star that is the remain of a high mass star. A black hole is so strong nothing-not even light, can escape.