How Stars Form
TRUE/FALSE. The space around stars contains gas and dust.
TRUE
How many percent stars spend of their lives on the main sequence?
90%
What is the size of low-mass and medium-mass stars compare to the sun?
Eight time as massive as the sun.
Because it consumes fuel very rapidly.
Astronomers theorize that the universe came into being at a single moment, in an event called the big bang.
Where do stars form?
What determines the mass of each young stars?
What is the dying star surrounded by?
TRUE/FALSE. As fusion slows in a high-mass star, pressure decreases.
TRUE
What is a galaxy?
A galaxy is a huge group of individual stars, star systems, star clusters, dust, and gas bound together by gravity.
What is a nebula?
A nebula is a large cloud of gas an dust spread out over a large volume of space.
What does a star's mass determine?
A star's mass determines the star's place on the main sequence and how long it will stay there.
What is a planetary nebula?
What is a supernova?
an explosion so violent that the dying star becomes more brilliant than an entire galaxy.
How many types of galaxy are there?
Astronomers classify galaxies into four main types: spiral, barred-spiral, elliptical, and irregular.
What is a protostar?
A protostar is a contracting cloud of gas and dust with enough mass to form a star.
TRUE/FALSE. the most massive star have small cores and produce the least energy.
FALSE. The mos massive star have large cores and produce the most energy.
What is the size of a white dwarfs?
A white dwarf is about the same size of the Earth but has about the same mass as the sun.
What is a neutron star?
Is the dense remnant of a high-mass star that has exploded as a supernova.
What is a black hole?
A black hole is a region of space containing so much matter that it collapses to an infinitely dense point.
When is a star formed?
What does small nebulas produce?
Small nebulas produce small, cool stars that are long-lived.
What is a black dwarfs?
When a white dwarfs becomes too cool to glow in visible light, it's called a black dwarf.
What is a pulsar?
A spinning neutron star that appears to gives off strong pulses of radio waves.
How old is the universe?