A star's brightness as if it were a standard sistance from Earth is known as what?
A star begins as part of a large cloud of gas and dust called what?
A system in which one star periodically blocks the light from another is called what?
A unit that is often used to measure distances between stars is called what?
The beginning stage of a star's life cycle is known as what?
Many stars belong to larger groups called what?
What is an imaginary pattern of stars?
A dying high-mass star can suddenly explode, becoming a what?
A huge group of single stars, star systems, star clusters, dust and gas bound together by gravity is called what?
The brightness of a star as seen from Earth is called what?
The most massive stars collapse to form what when they die?
Galaxies that appear to have a bulge in the middle and arms that move outward are called what?
Which of the following is not a characteristic of stars?
What determines how long a star will live?
Scientists use the power of ten to write very large or very small numbers in shorter form called what?
How are stars classified?
How to astronomers measure distances to stars?