Stars life Flashcards
What are stars?
Large balls of gas in which nuclear reactions take place producing large amounts of heat and light energy.
How do stars die?
When all the hydrogen atoms in a star run out, the star dies.
What happens to stars when they die?
When stars run out of fuel they die. Just before they die, they expand and become red giants.
How are stars born?
The accumulation of gas and dust from a Nebula, which collapses due to gravity.
What is a nebula?
A large area of dust and gas.
What do stars burn by?
The nuclear fusion of Hydrogen and Helium.
What is a protostar?
A small star that has not yet begun burning.
What is the cycle of Helium and Hydrogen in a star?
Hydrogen ignites in a shell around the core. Helium then ignites in the core and burns to carbon.
Why do stars expand when they die?
Stars die and expand in search of fuel.
What phase comes after the red giant phase?
White dwarfs.
What are white dwarfs?
A star that has collapsed and formed an extremely hot, dense core.
What is a supernova?
An explosion that large stars experience when they die.
What are the 2 stages that can occur after a supernova?
- Pulsar 2. Blackhole
What is a pulsar?
A rotating star.
What is a black hole?
The remains of an extremely large star that has exploded; nothing can escape - not even light can escape.
