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    basic astronomy questions

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    Four stars of different mass arrive on the Main Sequence of the Hertzsprung-Russell Diagram at the same time. Which star has a mass just about the same as the mass of the Sun?
    The star with spectral class B7
    The star with spectral class F1
    The star with spectral class G2
    The star with spectral class M4

    What is the correct sequence for stellar evolution?
    Protostar, main sequence, white dwarf, red giant
    Red giant, protostar, white dwarf, protostar
    White dwarf, main sequence, red giant, protostar
    Protostar, main sequence, red giant, white dwarf

    What is the escape velocity from the surface of Mars? Mars has a mass of 6.42 x 10^23 kilograms, and Mars' average radius is 3.37 x 10^6 meters. (The carat symbol means raising to a power. So 10^6 means 10 raised to the power of 6, which is 1 million.)
    5 kilometers per second
    9 kilometers per second
    13 Kilometers per second
    17 kilometers per second

    What is the escape velocity from the surface of Mars? Mars has a mass of 6.42 x 10^23 kilograms, and Mars' average radius is 3.37 x 10^6 meters. (The carat symbol means raising to a power. So 10^6 means 10 raised to the power of 6, which is 1 million.)
    5 kilometers per second
    9 kilometers per second
    13 Kilometers per second
    17 kilometers per second

    Suppose a newly discovered star has a parallax angle of 0.4 seconds. How far away is this star?
    0.4 parsecs
    2.5 parsecs
    17 parsecs
    40 parsecs

    Four stars of different mass arrive on the Main Sequence of the Hertzsprung-Russell Diagram at the same time. Which star will depart the Main Sequence first?
    The star with spectral class B2
    The star with spectral class F7
    The star with spectral class G9
    The star with spectral class K8

    Pollux is a star with spectral class K0. Its absolute magnitude is +0.8, and its apparent magnitude is +1.16. How far away is Pollux?
    4.5 parsecs
    11.8 parsecs
    19.7 parsecs
    27.4 parsecs

    Suppose a force of 51 Newtons is applied to an object with mass of 17 kilograms, initially at rest. How fast will it be moving 5 seconds later?
    17 meters per second
    9.81 meters per second
    27 meters per second
    15 meters per second

    An astronaut has a mass of 65 kilograms at the surface of the Earth? What is his weight at the surface of the Earth?
    65 kilograms
    374 Newtons, or 183 lb
    638 Newtons, or 143 lb
    529 Newtons, or 179 lb

    The astronaut in Question 11 goes to the Moon? What is his mass at the surface of the Moon?
    143 lb
    24 lb
    65 kilograms
    24 kilograms

    Suppose the red shift of a galaxy indicates that the galaxy is moving away from us at 295 kilometers per second. Using Hubble's Law and the current estimate of Hubble's constant, about how far away is this galaxy?
    2.7 Megaparsecs
    4.2 Megaparsecs
    6.1 Megaparsecs
    9.5 Megaparsecs

    Why does Mercury experience extreme high and low temperatures between daytime and nighttime?
    Its dense atmosphere creates a runaway greenhouse.
    It has virtually no atmosphere to moderate temperatures over the globe.
    It is so close to the Sun.
    Mercury has no axial tilt, with its equator always exposed to direct sunlight.

    What process takes place within stars to generate the tremendous amount of energy?
    nuclear fusion
    nuclear fission
    neutrino - anti-neutrino annihilation
    gravitational collapse

    Four stars of different mass arrive on the Main Sequence of the Hertzsprung-Russell Diagram at the same time. Which star has the smallest mass?
    The star with spectral class A2
    The star with spectral class F9
    The star with spectral class G7
    The star with spectral class M3

    Suppose a star's surface temperature is 14,000 K. At what wavelength will this star emit the most light?
    852 nanometers
    659 nanometers
    514 nanometers
    207 nanometers

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    https://brainmass.com/physics/astronomy/271120

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    Posits solutions to a series of basic astronomy questions - includes external references

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