Q&A Hero

Physic

Q: In a star, the condition of balance between the inward force of gravity and the outward force of thermal and radiation pressure is known as _______________ equilibrium. A) hydrostatic B) thermal C) photostatic D) magnetostatic
Q: One ______________ is the distance to a star when the star exhibits a parallax of one second of arc. A) parsec B) light-year C) astronomical unit D) million miles
Q: The imaginary, huge, apparently moving sphere on which the stars appear to be mounted is called the _______________ sphere. A) celestial B) global C) universal D) galactic
Q: The angular measurement in hours, minutes, and seconds from the celestial prime meridian eastward is called _______________. A) sundial B) protractor C) declination D) right ascension
Q: The angular measure in degrees north or south of the celestial equator is called _______________. A) declination B) azmuth C) altitude D) latitude
Q: Six trillion miles is equivalent in distance to one ______________. A) light-year B) astronomical unit C) parsec D) billion meters
Q: The apparent path that the Sun traces annually along the celestial sphere is known as the ______________. A) parabolic B) elliptic C) ecliptic D) eclipse
Q: The heliosphere is defined as the volume of space over which the ______________ extends. A) solar wind B) solar constant C) magnetic field D) gravitational field
Q: What is the value for the total energy that reaches each square meter of Earth from the Sun each second called? A) Solar constant B) Solar maximum C) Sunspots D) Solar wind
Q: The number of _______________ on the Sun varies over an 11-year cycle. A) sunspots B) rays C) canals D) valleys
Q: What is the pseudoscience that contends the planets' positions in the sky at the time of a person's birth affect the individual's personality or future? A) Astronomy B) Card reading C) Physics D) Astrology
Q: The Sun is a(n) A) cluster. B) planet. C) star. D) galaxy.
Q: What is the name given to all matter, energy, and space? A) Universe B) Galaxy C) Local group D) Solar system
Q: What is the temperature in kelvins of the visible surface of the Sun? A) 600 K B) 6 million K C) 6 billion K D) 6000 K
Q: What is the visible surface of the Sun called? A) Photosphere B) Atmosphere C) Stratosphere D) Glowing sphere
Q: A star of magnitude 0 is how many times brighter than a star of magnitude 6?
Q: A star of magnitude 3 is how many times brighter than a star of magnitude 5?
Q: A star of magnitude 2 is how many times brighter than a star of magnitude 4?
Q: The Ulyssesspace probe of the Sun encountered the planet Jupiter in 1998 and returned to make a second sweep over the Sun's poles in 2000"2001. Determine the time (in seconds and minutes) that it took a radio signal to reach Earth when the space probe was at Jupiter. (Use 778 106km for the distance from the space probe to Earth. The distance varies because Earth and Jupiter are orbiting the Sun.)
Q: Polaris, the pole star, is 208 parsecs away. Calculate the distance to Polaris in kilometers.
Q: Calculate the distance to the Sun in light-minutes.
Q: Determine the distance to Proxima Centauri in light-years, if it is 1.3 pc away.
Q: Proxima Centauri, the nearest star to the Sun, exhibits an annual parallax of 0.76 arcsec. Determine the distance to Proxima Centauri in parsecs.
Q: A(n) ______________ is equivalent to 3.26 light-years.
Q: The Sun remains stable because the inward pull of _____________ balances the outward push from nuclear fusion.
Q: The _______________ is the remnant of a supernova explosion observed in A.D. 1054.
Q: A(n) _____________is denser than a neutron star.
Q: The lifetime of a star is determined by its initial _____________.
Q: According to the _______________ theory, the universe began from a single point 13.7 billion years ago.
Q: The branch of astronomy that studies the structure and evolution of the entire universe is called _______________.
Q: The dying glow of the Big Bang is called the _______________.
Q: The recent modification of the standard Big Bang model is called the _______________ model.
Q: The fundamental components in the structure of the universe are the _______________.
Q: "All distant galaxies are moving away from us, and the farther away a galaxy is from us, the faster it is moving" is a statement of _______________ law.
Q: The most distant known objects in space are called _______________.
Q: Astronomers believe that most of the matter that makes up the universe is not detected by any part of the electromagnetic spectrum. This mysterious matter is called _______________.
Q: An extremely large collection of stars bound together by gravitational attraction and occupying a huge volume of space is called a(n) _______________.
Q: Clusters containing clusters of galaxies are called _______________.
Q: The cluster of galaxies that includes our Milky Way is called the _______________.
Q: The letters LMC refer to the galaxy named _______________.
Q: Our home galaxy is called the _______________.
Q: Another name for a pulsar is _______________.
Q: A Type II supernova can form a(n) _______________ or a black hole.
Q: A point in the universe where the density of matter and the gravitational field are theoretically infinite is called a(n) _______________.
Q: The "surface" of a black hole is known as the _______________.
Q: The cataclysmic explosion of a star that throws most of its matter into space is called a(n) _______________.
Q: An incredibly dense star so massive that light cannot escape from its surface is called a(n) _______________.
Q: The remaining core of a planetary nebula is called a(n) _______________.
Q: When the Sun moves off the main sequence, it will next become a(n) _______________.
Q: The two types of bright nebulae are emission nebulae and _______________ nebulae.
Q: The greater the mass of a star, the _______________ it moves through its life cycle.
Q: Gas and dust distributed among the stars is known as the _______________.
Q: The creation of elements inside a star is called _______________.
Q: When the absolute magnitudes, or brightnesses, of stars are plotted against their surface temperatures or colors, we obtain a(n) _______________ diagram.
Q: Familiar groups of stars that are part of a constellation or parts of different constellations are called _______________.
Q: Eighty-eight prominent groups of stars in the sky are called the _______________.
Q: The Greek astronomer who assigned the stars to six magnitudes was named _______________.
Q: On the H-R diagram, the Sun lies on the _______________.
Q: The stars of highest photospheric temperature are those of spectral class _______________.
Q: The closest star to the Sun is named _______________.
Q: A star of magnitude 1 appears _______________ times brighter than a star of magnitude 2.
Q: In a star, the condition of balance between the inward force of gravity and the outward force of thermal and radiation pressure is known as _______________ equilibrium.
Q: One _______________ is defined as the distance to a star when the star exhibits a parallax of one second of arc.
Q: The imaginary, huge, apparently moving sphere on which the stars appear to be mounted is called the _______________ sphere.
Q: The angular measurement in hours, minutes, and seconds from the celestial prime meridian eastward is called _______________.
Q: The angular measure in degrees north or south of the celestial equator is called _______________.
Q: Six trillion miles is equivalent in distance to one _______________.
Q: The apparent path that the Sun traces annually along the celestial sphere is known as the _______________.
Q: The volume of space over which the _______________ extends is called the heliosphere.
Q: The value for the total energy that reaches each square meter of Earth from the Sun each second is called the _______________.
Q: The three fusion reactions used by the Sun to generate energy are together known as the _______________.
Q: The number of _______________ appearing on the Sun varies over an 11-year cycle.
Q: The pseudoscience called _______________ contends that the planets' positions in the sky at the time of a person's birth affect the individual's personality or future.
Q: The Sun is a(n) _______________.
Q: The _______________ is the name given to all matter, energy, and space.
Q: The visible surface of the Sun has a temperature of about _______________ K.
Q: The visible surface of the Sun is called the _______________.
Q: Which of the following is part of the Sun's structure? A) Globular cluster B) Accretion disk C) Singularity D) Corona
Q: The majority of stars are A) white dwarfs. B) giants. C) main-sequence stars. D) neutron stars.
Q: The modification of the standard Big Bang theory is known as the A) cosmic model. B) Hubble-Leavitt model. C) inflationary model. D) Hertzsprung-Russell model.
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