1. Which phrase best describes a star?
I. Stars are self-luminous gaseous spheres. II. Stars are massive objects, and most of them are bigger than planets. III. Stars are celestial objects consisting mostly of hydrogen and helium.
Only one of the choices is correct. Only two of the choices are correct. Choices I, II, and III are correct. None of the choices are correct.
Only one of the choices is correct.
Only two of the choices are correct.
Choices I, II, and III are correct.
None of the choices are correct.
2. What makes stars shine?
Stars shine due to the chemical combustion of hydrogen. Stars reflect light from planets. The fusion of hydrogen into helium is a star's energy source. A star's light is attributed to the radioactive decay of heavy elements.
Stars shine due to the chemical combustion of hydrogen.
Stars reflect light from planets.
The fusion of hydrogen into helium is a star's energy source.
A star's light is attributed to the radioactive decay of heavy elements.
3. Do stars shine forever?
Yes No
Yes
No
4. Why are stars important to us?
Carbon, nitrogen, oxygen, and other elements needed for life were produced by stars. Stars can be connected with imaginary lines to form pictures. Stars can grant our wishes. You can see stars whenever you get hit on the head.
Carbon, nitrogen, oxygen, and other elements needed for life were produced by stars.
Stars can be connected with imaginary lines to form pictures.
Stars can grant our wishes.
You can see stars whenever you get hit on the head.
5. What is a light-year?
The distance light can travel in one day's time The distance light can travel in one year's time A year that has 366 days instead of 365 A year in which the Sun has solar flares
The distance light can travel in one day's time
The distance light can travel in one year's time
A year that has 366 days instead of 365
A year in which the Sun has solar flares
6. What is a supernova?
An automobile that has been specially turbo-charged A violently exploding star A celestial object that enters the atmosphere of a planet An asteroid
An automobile that has been specially turbo-charged
A violently exploding star
A celestial object that enters the atmosphere of a planet
An asteroid
7. How many hydrogen nuclei are required to make a helium nucleus during fusion?
1 4 8 16
1
4
8
16
8. What is the temperature in degrees Kelvin if a thermometer reads 27 degrees Celsius?
80 degrees -246 degrees 300 degrees 540 degrees
80 degrees
-246 degrees
300 degrees
540 degrees
9. How many 100-watt light bulbs are required to compare to the Sun's brightness?
Four trillion trillion Four billion billion Four million million Four
Four trillion trillion
Four billion billion
Four million million
Four
10. What is the radius of the Sun?
6,500 kilometers 700,000 kilometers 4,000 miles 435,000 miles
6,500 kilometers
700,000 kilometers
4,000 miles
435,000 miles
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