Exam 8: The Deaths of Stars

What are the two longest stages in the life of a one solar mass star?

Because more massive stars have more gravitational energy,they can fuse heavier nuclear fuels.

What produces synchrotron radiation?

Once a star ejects a planetary nebula,it becomes a white dwarf.

The event horizon marks the boundary within which the density is roughly the same as that of the atomic nucleus.

What is the term for the form of electromagnetic radiation produced by rapidly moving electrons spiralling through magnetic fields?

What is the difference between a planetary nebula and a supernova remnant?

Why are star clusters important to our study of stars?

Young star clusters have bluer turn-off points than old clusters.

What is the term for a collection of 100 to 1000 young stars in a region about 80 light-years in diameter?

Why can't a massive star generate energy through iron fusion?

A scientific theory can be proven true if the correct experiments are performed.

Which of the following has a radius of about 10 kilometres and is supported by the pressure associated with degenerate neutrons?

LMC X-3 is a binary system that is believed to contain a black hole.

Which of the following is NOT a property of pulsars?

The ____________________ of a black hole is the radius from the black hole at which the escape velocity is equal to the speed of light.

After they leave the main sequence,what happens to stars with masses between 0.4 and 4 solar masses?

What principle explains why matter flowing from one star in a binary system to its companion forms an accretion disk?

The maximum mass of a white dwarf is ____________________ solar masses.

Why can't lower main-sequence stars become giant stars?