What is the closest location you could find material formed in a supernova?
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Science
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University
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Easy
Stevie Nicks
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24 questions
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1.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
The Sun
Earth's core
The Crab Nebula
Your body
The center of the Milky Way Galaxy
2.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
Edwin Hubble measured the apparent brightness of Cepheid variable stars in galaxies to determine distances, and he found that the more-distant galaxies are moving away from us faster than less-distant galaxies.
True
False
3.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
Which one of the following statements about our Sun is TRUE?
Both the core and the corona are much hotter than the photosphere.
The Sun is a very active star, blasting waves of energy, solar flares, and winds continuously and uniformly with time.
The apparent motion of sunspots on the Sun is caused mainly by Earth's orbit
Being an uncharged (i.e. natural) star, the Sun does not have a magnetic field.
Sunspots were first discovered recently, using telescopes in space.
4.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
Which one of the following statements about the Doppler-wobble method is FALSE?
The Doppler wobble is caused by the reflex motion of a star that has an orbiting planet.
The Doppler wobble method is larger for a planet that is far from a star than for one having the same mass that is near the star.
The radial velocity of a star can be measured from its spectrum.
The Doppler-wobble method which led to the discovery of most exoplanets initially, is now second to the transit method in the total number of detected exoplanets.
The Doppler-wobble method generally provides only a planet's minimum mass.
5.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
In white dwarfs, brown dwarfs, and black dwarfs, "electron degeneracy pressure" prevents gravitational collapse.
True
False
6.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
If you have already measured the surface temperature of star Medford, then to determine its radius you must also measure
the amount of time it takes an exoplanet to transit across Medford's surface.
the shift in stellar motion due to Doppler wobble.
the changing position of star Medford throughout a night of observation.
the wavelength of the peak of star Medford's spectrum
the distance to Medford and its apparent brightness.
7.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
Which one of the following statements is FALSE?
Pre-main-sequence stars shine by releasing gravitational potential energy while contracting and heating up.
Main-sequence stars shine by converting most of the mass of atomic nuclei into energy according to the equation E=mc^2
A main-sequence star becomes a red giant as its helium core contracts, releasing energy and causing a hydrogen-fusing shell to fuse more vigorously.
At some point in time, a sufficiently massive red giant can shine by fusing helium to carbon and oxygen in its core.
White dwarfs shine primarily because atomic nuclei lose their kinetic energy.
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