The apparent movement of a star when seen from a different postition is called?
What is a parallax?
100
A light year is:
What is the distance light travels in a year?
100
The sun is located 1.5 x 10^11 meters away from Earth. When all the zeros are written out this distance is:
What is 150,000,000,000 m.?
100
Eclipsing binary stars can sometimes be identified because?
What is they become dimmer at regular intervals?
100
One indication that a planet may exist near a distant star is that?
What is the star has a very slight back and forth motion?
200
Parallax is used to determine a star's?
What is distance from earth?
200
A loose grouping of a few thousand stars is called a(n)?
What is an open cluster?
200
The lifetime of a star depends on its:
What is mass?
200
Characteristics used to classify stars include?
What are size, brightness, and temperature?
200
The Milky Way galaxy is an example of a(n):
What is spiral galaxy?
300
What is a giant ball of hot gases that undergo nuclear fusion?
What is a star?
300
Which two factors did Newton conclude combine keeping Earth in orbit?
What are inertia and gravity?
300
In which part of the sun does nuclear fusion occur?
What is the core?
300
The absolute brightness of a star depends on its:
What are size and temperature?
300
Which of the following is a major difference between elliptical galaxies and spiral galaxies?
a. Elliptical galaxies have almost no gas or dust between the stars.
b. Elliptical galxies vary more in shape than spiral galaxies.
c. Spiral galaxies have almost no gas or dust between the stars.
d. Spiral galaxies contain only old stars.
What is A:Elliptical galaxies have almost no gas or dust between the stars.
400
More than half of all stars are members of groups of two or more stars called?
What is star systems?
400
Depending on its mass, a star may live from about:
What is 10 million to 200 billion years?
400
The solar wind is a stream of electrically charged particles that ext5end outward from the sun's:
What is the corona?
400
The Hertzsprung-Russell diagram shows that main-sequence stars:
What is increase in brightness as they increase in temperature
400
The strength of the force of gravity depends on:
What is the masses of the objects and the distance between them?
500
Gravity helps from stars, planets, and solar systems by gradual gathering together of smaller pieces in a process called?
What is accretion?
500
A supernova is the explosion of a dying:
What is high-mass star?
500
What are sun spots?
What are darker, cooler areas on the surface of the sun.
500
The variable that determines whether a protostar becomes a star it its?
What is mass?
500
The force that pulls together the matter in stars is: