Show:
The Sun
Stars
Life Cycle of Stars
Groups of Stars
The Expanding Universe
100
What will happen to the relative amounts of hydrogen and helium in the sun over the next few billion years? a. Hydrogen will increase and helium will decrease. b. Hydrogen will decrease and helium will increase. c. Both hydrogen and helium will decrease. d. Both hydrogen and helium will remain the same.
What is B. Hydrogen will decrease and helium will increase.
100
The parallax of a star is observed because a. all stars have the same apparent brightness. b. parallax increases with distance. c. stars do not move. d. the observer moves.
What is D. the observer moves
100
Low-mass and medium-mass stars eventually A grow into supergiants. c. become neutron stars. b. become supernovas. d. turn into white dwarfs.
What is D. turn into white dwarfs
100
Older stars are most likely found in a. the arms of spiral and barred-spiral galaxies. b. elliptical galaxies. c. irregular galaxies. d. both (a) and (b)
What is B. elliptical galaxies
100
The big bang theory explains the a. origin of the universe. c. Doppler effect. b. life cycle of a star. d. arrangement of constellations.
What is A. origin of the universe
200
The sun remains stable over time because a. its supply of hydrogen is inexhaustible. b. the product of fusion, helium, is a stable element. c. the inward pull of gravity and outward push of thermal pressure are balanced. d. nuclear fusion is a stabilizing process.
What is C. the inward pull of gravity and outward push of thermal pressure are balanced
200
The apparent brightness of a star a. varies with the position from which it is viewed. b. can be calculated from its absolute brightness and mass. c. is greater as distance from the sun increases. d. is a measure of its light viewed from any position.
What is A. varies with the position from which it is viewed.
200
Both high-mass and low-mass adult stars are classified as a. main-sequence stars. c. supernovas. b. white dwarfs. d. neutron stars.
What is A. main-sequence stars
200
When the absorption lines of a galaxy shift toward the blue end of the spectrum, it means that the galaxy is a. moving away from Earth. c. moving closer to Earth. b. small and young. d. large and old.
What is C. moving closer to Earth
200
Which of the following provides support for the big bang theory? a. red shift b. cosmic microwave background radiation c. elliptical galaxies d. both (a) and (b)
What is D. red shift and cosmic microwave background radiation
300
Nuclear fusion within the sun takes place within the ____________________.
What is the core.
300
A hot, bright star would appear in which section of an H-R diagram? a. lower left c. upper left b. upper right d. lower right
What is C. upper left
300
What is a pulsar? a. the remains of a low-mass star after it explodes b. a spinning neutron star emitting radio waves c. another name for a protostar d. the stage before a dying star becomes a supernova
What is D. the stage before a dying star becomes a supernova
300
A group of two or more stars held together by gravity is called a(an) ____________________.
What is a star system.
300
The apparent change in frequency and wavelength of a sound or light source as it moves toward or away from an observer is called the ____________________.
What is Doppler effect.
400
What is the innermost layer of the sun’s atmosphere called?
What is the photosphere.
400
In an H-R diagram, most stars are found in a diagonal band from the upper left to the lower right, which is called the ____________________.
What is main sequence.
400
A contracting cloud of dust and gas with enough mass to form a star is called a(an) ____________________.
What is a protostar.
400
A group of two or more stars held together by gravity is called a(an) ____________________.
What is a star system.
400
Matter that does not give off any radiation is called ____________________.
What is dark matter.
500
Prominence's and solar flares' appear near what atmosphere feature?
What is a sunspot.
500
By using a spectrograph, a star’s absorption lines can identify the different ____________________ that a star is composed of.
What is an element.
500
What two factors cause a nebula to develop into a star?
What is gravity and heat from contraction.
500
Why do globular clusters generally contain only old stars?
What is they lack sufficient dust and gas to form new stars.
500
A binary system in which one star passes in front of the other, blocking some light from reaching Earth is called a(an) ____________________ binary.
What is an eclipsing binary.