Friday 2/17 BellRinger

Method used by astronomers to calculate the distance to nearby stars, using the apparent shift of the star relative to more distant stars

• Parallax

• Light-Year

• Prototype

• Parsec

90% of stars fuse hydrogen atoms to form helium atoms in their cores, these are typically called _______________

• Average Stars

• Outlier Stars

• Main Sequence Stars

• Star Clusters

A _________ star is a remanent of a massive star after it has exploded as a super nova

• Red Super Giant

• Black hole

• Neutron

• Planetary Nebula

Stars differ in all of the following except

• mass

• temperature

• age

• composition

A _______________ looks like a star but its core is not yet hot enough for fusion to take place. The luminosity comes exclusively from the heating of the contracting elements

• White Dwarf

• Nebula

• Neutron Star

• Protostar

A black dwarf star is considered theoretical because

• Because we know they are out there but we just haven't observed them yet

• Because they are consumed by black holes

• Our galaxy is not old enough because white dwarfs would take trillions of years to burn

• Because they are black and it makes it difficult to see them against dark matter since neither emit light