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The Hertzsprung-Russell diagram shown is divided into four sections. Which section of the diagram includes the coolest, brightest stars?
29Section 4
Section 1
Section 3
Section 2
- Q1
The Hertzsprung-Russell diagram shown is divided into four sections. Which section of the diagram includes the coolest, brightest stars?
Section 4
Section 1
Section 3
Section 2
120s8.8a - Q2
The spectral classes of four stars are shown in comparison with an HR diagram. Based on the information, which star is most like the sun?
Star 1
Star 4
Star 2
Star 3
120s8.8a - Q3
Which statement is true about stars?
White dwarfs become main sequence stars when they gain mass.
Main-sequence stars are formed by comets.
Star formation begins in the nebula.
Supergiants are stars that can absorb black holes.
120s8.8a - Q4
Which statement best describes a galaxy?
a system of billions of stars, gas and dust held together by gravity
a mass of dust and ice that orbits a star in an elliptical pattern
a ball of plasma that experiences nuclear fusion in its core
a cloud of gas that is the birthplace of stars
120s8.8a - Q5
Most stars in the universe fit into one of the four areas on the HR Diagram. Which area of the diagram represents white dwarfs?
area p
area z
area x
area m
120s8.8a - Q6
Barnard's Star is about 5.9 light years from the sun. The star has an approximate temperature of 2800 K. Based on the diagram, what spectral class does Barnard's Star belong too?
Spectral Class A
Spectral Class B
Spectral Class M
Spectral Class O
120s8.8a - Q7
The universe has many different components. Which list places four components of the universe in the most likely order from smallest to largest?
moon, planet, star, nebula, galaxy
galaxy, nebula, star, planet, moon
nebula, moon, star, planet, galaxy
moon, star, planet, galaxy, nebula
120s8.8a - Q8
A student learns that the sun is classifies as a medium size star and that many stars are much bigger and brighter. However, the student observes that the other stars look very dim, even through a telescope. Why do other stars look much dimmer than the sun?
the sun appears yellow, which is more visible than other colors
as light from other stars travel through space, it gets reflected
other stars are made up of different gases than the sun is.
the sun is much closer to the Earth than the other stars
120s8.8b - Q9
With the use of the Hubble Space Telescope, scientists recently discovered a giant runaway star. It is 90 times larger than the sun and is very hot and blue-white in color. Why does the sun appear brighter than this runaway star when viewed from Earth?
the sun is made up of different elements than the runaway star
the sun is a different color than the runaway star
the sun is older than the runaway star
the sun is closer to the Earth than the runaway star
120s8.8b - Q10
The temperature of a star determines the wavelength of visible light that is produced. The visible part of the electromagnetic spectrum is shown. Stars with the highest temperatures will emit most of their light at wavelengths that are near -
orange light
red light
green light
blue light
120s8.8c - Q11
A diagram of the electromagnetic spectrum is shown. Earth's atmosphere blocks short wavelengths of the EM spectrum. Which telescopes must be placed in orbit around the Earth in order to observe short wavelength radiation?
radio telescopes
infrared telescopes
gamma ray telescopes
visible light telescopes
120s8.8c - Q12
Quasars are extremely distant celestial bodies. Investigators using a special telescope determines that a certain quasar was emitting waves with a frequency of 1.41 x 109 Hz. An electromagnetic spectrum is shown. The investigators were most likely using a telescope that detects -
xrays
microwaves
gamma rays
visible light
120s8.8c
