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AST 1003
| Question | Answer |
|---|---|
| The Sun is completely covered by the Moon during a TOTAL solar eclipse, but not during an ANNULAR solar eclipse because... | The moon is farther from the earth during an annular eclipse than it is during a total eclpise |
| Suppose it is late afternoon, about an hour before sunset. Which of the following is most likely to be the Sun's azimuth and altitude? | Azimuth NW, altitude 10 degrees |
| The star Alpha Draconis has a magnitude of 2.4. The star Gamma Orionis has a magnitude of 1.5. Which star appears brighter? | Gamma Orionis |
| A solar eclipse can only occur near the time of... | New Moon |
| During the eclipse of the Moon, the lunar surface ofter appears red because... | Refraction or bending of the sun's rays through Earth's atmosphere |
| As seen from Tampa, at what time of the year is the noon Sun highest in the sky? | Summer solstice |
| The Sun crosses the equator headed northward at the time of the... | Spring equinox |
| During the course of the year, the Sun appears to travel along the | ecliptic |
| Of what significance are the twelve constellations of the zodiac? | The Sun, Moon and planets can be found in them |
| The point in the sky around which all stars appear to rotate is called the | Celestial pole |
| A total solar eclipse is considered a rare sight because | The Moon's shadow covers a very small part of the Earth's surface |
| The compass direction of an object, relative to the cardinal points, is referred to as its | Azimuth |
| In the modern usage of the term, a constellation refers to | A specific region in the sky with well- defined boundaries |
| Which planet or planets can never be seen late at night? | Mercury and Venus |
| What distinguishes the north star, Polaris, from all the others? | The Earth's axis points in the direction of that star |
| The point in the sky directly above you is called the | Zenith |
| A planet at opposition would | rise at sunset |
| If you see a full moon low in the western sky, approximately what time of the day or night is it? | Sunrise |
| Of the following stars in Orion, which is most likely to be the brightest among those listed? | Beta Orionis |
| On the magnitude scale, which of the following stars would you need a telescope to see? | Magnitude 20 |
| Spring will begin on March 22. On that day the Sun will set... | due West |
| Conditions are favorable for an eclipse during an eclipse season. Eclipse seasons occur | Twice a year |
| Where on Earth would the Sun pass directly overhead at some point during the year? | Within the Tropics, or within +/- 23.5 degrees of the equator |
| How much of the Moon we see brightly illuminated depends on | It's position relative to the Sun |
| Which of the following phases are in the correct chronological order? | waxing crescent, first quarter, waxing gibbous, full moon |
| One reason the weather is warmer in July than in January in the northern hemisphere is that | There are more hours of daylight in July |
| Eclipses can only occur when the Moon is on or very near | the vernal equinox |
| People in ancient times distinguished the planets from the stars because the planets | Move relative to the stars |
| A conventional NASA spacecraft would take ____ to reach the most distant planet in our solar system, and___ to reach the next nearest star. | a few years; several thousand years |
| What must you do to put an object in orbit around the Earth? | Throw it parallel to the ground at a speed of atleast 5 miles/sec |
| What is the first stage in the formation of a new star? | the gravitational contraction of a cloud of interstellar gas |
| The most abundant element in the universe is | hydrogen |
| The process by which solid particles in the early solar nebula gently collide and stick together to form larger objects, somewhat like a rolling snowball growing larger and larger, is called | accretion |
| Why do astronauts feel weightless in the International Space Station? | Because the Station is in a constant free- fall around the Earth |
| A common way of interplanetary spacecraft can be accelerated and have its trajectory changed without the use of fuel is via | a gravitational assist from another planet |
| The rate of impact cratering on the planets and moons of our solar system | declined dramatically in the first billion years, and has remained nearly constant since then |
| A contracting cloud of gas will tend to | spin faster and heat up as it contracts |
| What molecule is the major contributor to the green house effect on Earth? | Carbon Dioxide |
| The condensation stage in the early history of the solar system refers to the | formation of solid particles as the solar nebula cools |
| What processes can alter a planets surface? | impact cratering, volcanism, tectonics, erosion |
| We don't see background stars in pictures of astronauts on the Moon because | the photos were snapshots, exposed for the sunlit surface. |
| According to the current model of planet formation, the planets have a common orbital plane because | they formed a rotating , pancake- shaped cloud of gas |
| According to the new definition of "planet" recently adopted by the International Astronomical Union, Pluto no longer qualifies because | it has not cleared the neighborhood around its orbit |
| One sentence describing the difference in size and composition of the Terrestrial and Jovian planets? | A larger variety of compounds condense at lower temperatures far from the sun |
| In order of increasing abundance , the materials that make up objects in the solar system are | metals; rocky silicates; hydrogen compounds; hydrogen and helium gas |
| Suppose you want the space craft to be captured into orbit around Mars. which maneuver would be most appropriate? | an aerobraking maneuver |
| In the early solar system, proto- planets were built up from the merger and coalescence of smaller bodies called | Planetesmals |
| What do all the planets have in common? | They all revolve in the same direction |
| When we arrange the terrestrial planets in order of increasing mass, we find that the larger planets tend to have | fewer craters |
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