Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
10 Cards in this Set
- Front
- Back
Characteristics used to classify stars include _, _, _, _, and _.
|
color, temperature, size, composition, and brightness.
|
|
Astronomers often use ____ to measure distances to nearby stars.
|
parallax
|
|
A light-year is the distance that light travels in one year, about _._ million million _____.
|
9.5
kilometers |
|
Astronomers use H-R diagrams to ___________________________ ___________________________.
|
classify stars and to understand how stars change over time.
|
|
A star is born when...
|
the contracting gas and dust from a nebula become so dense and hot that nuclear fusion starts.
|
|
How long a star's life is depends on its...
|
mass.
|
|
All stars begin their lives as parts of ______.
|
nebulas.
|
|
T or F: Stars with more mass last longer than stars with less mass.
|
False.
|
|
After a star runs out of fuel, it becomes a _, _, or _.
|
white dwarf, a neutron star, or a black hole.
|
|
Astronomers classify most galaxies into three main categories
|
spiral, elliptical, and irregular.
|