Space
the study of stars, planets, and all other heavenly bodies
astronomy
the name of the galaxy in which we live
Milky Way
Stars outlining an imaginary picture are called ___?
a constellation
What is the average distance from the earth to the sun?
approx. 93 million miles
When a stars suddenly flares up, it is called ___?
nova
scientists who study outer space
astronomers
a star system containing millions and billions of stars
the north star
Polaris
the hottest part of the Sun
core
When a star explodes, it is called a ____?
Supernova
an area containing no air or any other matter
vacuum
name three of the basic galaxy shapes
spiral
irregular
elliptical
the brightest of all constellations
Orion
The distance that light travels in a year is called ___?
light year
When two stars appear to be very close together from earth, but are actually very far apart, it is called ___?
optical double
the force that resists motion
friction
what is the name of large clouds of gas and dust floating in space
nebulae
the most distant object that can be seem with the naked eye
Andromeda Galaxy
Cooler patches on the Sun are called ___?
sun spots
When two stars circle around each other, it is called ___?
binary star
Give two reasons why you would need a space suit in space.
1. provides oxygen
2. protects from extreme temperatures
Our Milky Way galaxy is in a cluster of about 40 galaxies known as _____?
Local Group
the brightest star in the night sky
Sirius
The sun's visible surface is called ___?
photosphere
Explain the difference between apparent magnitude and absolute magnitude.
The absolute magnitude is the amount of light a star produces and apparent magnitude is how bright a star appears from earth.