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Grade 9 Science SpaceGrade 9 Science Astronomy Questions and Answers
Which object has such a strong surface gravity that light cannot escape it?
a. black hole
b. b. black dwarf
c. c. red giant
d. white dwarf
What is a supernova?
A brilliant explosion tht marks the end of a massive star.
What is the first stage in the formation of a star?
A nebula or cloud of dust and gases.
Which star below blows up in a supernova explosion.
a. low mass star
b. b. medium mass star
c. massive star
Binary stars can be used to establish what property of stars?
Binary stars can be used to establish a star's mass.
What is the last stage in the formation of a star?
A black dwarf.
All stars eventually run out of fuel and collapse due to gravity.
a. True
b. False
What is apparent magnitude?
The brightness of a star as seen from Earth.
Name the eight stages in the life span of a star starting with its birth and
ending with its death.
Dust and gases, protostar, main sequence, red giant, variable
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, Grade 9 Science Space
stage, planetary nebula, white dwarf, black dwarf
An average star spends 90 percent of its life as a helium-burning main-
sequence star.
a. True
b. False
Which color stars have the highest surface temperature?
a. red
b. b. orange
c. c. yellow
d. blue
Distances to stars are usually expressed in units called
a. miles
b. b. kilometers
c. c. light-years
d. astronomical units
What is a light year?
The distance that light travels in one year.
The Solar System is defined as:
a. The family of stars in our galaxy
a. b. The family of the sun, planets, and their moons
b. c. The family of the planets and moons
c. d. The family of the sun, stars, moons, and planets
The measure of a star's brightness is called its
a. color index
b. b. visual binary
c. c. magnitude
d. d. parallax
Which type of star is the sun?
a. black hole
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, Grade 9 Science Space
b. b. black dwarf
c. c. main sequence
d. red giant
List three factors that control the apparent brightness of a star as seen from
Earth.
how big it is, how hot it is, how far away it is
A star's color can tell you what its approximate temperature is.
a. True
b. False
What does a Hertzsprung-Russell (H-R) diagram show.
a. the location of stars in the sky
b. b. the absolute magnitude and temperature of the stars
c. the apparent magnitude and temperature of the stars
c. the absolute magnitude and mass of stars
The sun produces energy by nuclear fission.
a. True
b. False
What is the name of the dark region on the surface of the photosphere?
sunspot
What is the name of the relatively thin layer of the sun's atmosphere?
Chromosphere
When a wave source is moving toward or away from an object, the
wavelength changes, a phenomenon known as the Doppler
Effect .
Astronomers usually study an object by looking directly through a telescope.
a. True
b. False
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