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Astronomy 110 Final Exam Questions with 100% correct answers | verified | latest update 2024
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Astronomy 110 Final ExamHow many constellations are there? - ANS-88 constellations
lookback time - ANS-The time elapsed between when we detect the light here on Earth
and when it was originally emitted by the source, is known as the 'lookback time'.
Center of Milky Way - ANS-The Galactic Center (or Galactic Centre) is the rotational
center of the Milky Way galaxy; it is a supermassive black hole of 4.100 ± 0.034 million
solar masses, which powers the compact radio source Sagittarius A.
Period- Luminosity relation - ANS-In astronomy, a period-luminosity relation is a
relationship linking the luminosity of pulsating variable stars with their pulsation period.
The best-known relation is the direct proportionality law holding for Classical Cepheid
variables, sometimes called Leavitt's law.
A/G star characteristics - ANS-Red-orange-yellow star, or G star, is a main-sequence
star (luminosity class V) of spectral type G. Such a star has about 0.84 to 1.15 solar
masses and surface temperature of between 5,300 and 6,000 K.
m, M, d - ANS-m= Apparent
M= Absolute Magnitude
d= Distance
Why does the North Star not move? - ANS-Polaris is very distant from Earth, and
located in a position very near Earth's north celestial pole and is the center of the star
field so it shows essentially no movement. Earth's axis points almost directly to Polaris,
so this star is observed to show the least movement.
E- A, B, C, D, E - ANS-Mercury
C M B R - ANS-The cosmic microwave background (CMB, CMBR), in Big Bang
cosmology, is electromagnetic radiation which is a remnant from an early stage of the
universe, also known as "relic radiation". The CMB is faint cosmic background radiation
filling all space.
Inflation Theory - ANS-Theory that upholds the big bang theory, but suggests there was
an extremely rapid expansion milliseconds after the big bang
, Rapid variation of Quasar - ANS-Many quasars show rapid variation in their light and
radio output. This fact places a limit on their physical size; for if an object shows
variability on a characteristic time scale T its size must be limited by cT, where c = the
speed of light. By now more than 5000 quasars are known.
Moons that excite exobiologist - ANS-Titan and Europa
Drake Equation - ANS-an equation that lays out the factors that play a role in
determining the number of communicating civilizations in our galaxy
Stellar Parallax - ANS-The apparent shift in the position of a nearby star (relative to
distant objects) that occurs as we view the star from different positions in Earth's orbit of
the Sun each year. Measures of stellar distance.
15 degrees per hour sky motion - ANS-The angular speed 15 degrees per hour. What's
most important is that all the objects in the sky, stars, planets (even the moon) undergo
the same motion.
Kepler's first, second, and third laws - ANS-There are actually three, Kepler's laws that
is, of planetary motion: 1) every planet's orbit is an ellipse with the Sun at a focus; 2) a
line joining the Sun and a planet sweeps out equal areas in equal times; and 3) The
square of the orbital period of a planet is proportional to the cube of the semi-major axis
of its orbit.
Isotropic - ANS-Having identical values of a property in all crystallographic directions.
Galactic Rotation Curve & Dark Matter - ANS-One point of evidence in support of dark
matter is the way in which the speed of stars, gas and dust in a galaxy varies with their
distance from the center of the galaxy, known as the galactic rotation curve.
Supermassive Black Hole - ANS-Giant black hole, with a mass millions to billions of
times that of our Sun, thought to reside in the centers of many galaxies and to power
active galactic nuclei.
Greenhouse Gas - ANS-Gases such as carbon dioxide, methane, nitrous oxide, water
vapor, and ozone in the atmosphere which are involved in the greenhouse effect.
Moon's Origin - ANS-A mars sized object struck the earth and dislodged debris which
became the moon
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