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Astronomy exam #3
Astronomy 100 exam #3
| Question | Answer |
|---|---|
| True or False: ALl of the Jovian planets have very low densities indicating a relatively high abundance of lighter elements like hydrogen and helium. | True |
| True or False: The ring systmes of all the Jovian planets seem to be made of the same kind of material. | False - they all seem to be made up of different material from ice to rock and dust |
| True or False: Of all planets and moons in the solar system, Titan is probably the best analogue to the Earth's environment before life began on our planet. | True |
| _____________ has the only really bright ring system in the solar system. | Saturn |
| Jupiter's observed __________ rotation shows that the planet is mostly a gaseous object. | Differential |
| _______ takes nearly a year to orbit Neptune. | Nereid |
| ________ has a dense atmosphere of nitrogen | Titan |
| ________ is a satellite of Jupiter | Callisto |
| ________ is the largest satellite orbiting Neptune | Triton |
| The rotational periods of the Jovian planets are... | all shorter than that of Earth |
| The Great Red Spot is.... | an enormous storm system of Jupiter |
| The temperatures of Jupiter and Saturn are... | higher than can be explained by the energy recieved from the Sun and the energy they radiate |
| The Roche limit refers to the... | minimum distance between a planet and a large satellite |
| Uranus was discovered by... | Herschel |
| Of the following, Neptune is most similar in size to... | Uranus |
| Which of planet is home to The Great Dark Spot? | Neptune |
| What planets magnetosphere can be observed in radio wavelengths, evelops most of the planets satellites, is supplied with large amounts of particles by Io's volcanic eruptions? | Jupiter |
| The blue-green appearance of Uranus is caused by... | methane in its atmosphere; methane preferentially absorbs the red parts of the solar spectrum |
| True or False: Pluto was discovered by Percival Lowell. | Flase. Pluto was actually discovered by Clyde Tombaugh |
| True or False: In general, a comet's tail points away from the Sun. | True |
| The point in the sky from which a meteor shower appears to originate is called the .... | Radiant |
| __________ are rocks in outer space. | Meteroids |
| __________ cause flashes of light in the atmosphere. | Meteors |
| _________ can be collected on the Earth's surface. | Meteorites |
| _________ have a coma and a tail. | Comets |
| A __________ is a way to describe a comentary nucleus. | dirty snowball |
| __________ types are the most common found meteorite. | Irons |
| _________ types are the most abundant meteorite (but more difficult to find) | Stones |
| __________ orbit between Mars and Jupiter | Asteroids |
| Which of the following is the largest asteroid/dwarf planet: Phobos, Europa, Olympus Mons, Rille, Ceres | Ceres |
| Pluto's existence had been predicted because of ..... | perceived irregularities in Uranus' orbit |
| Most asteroids are probably... | material from the early solar system that never formed a planet |
| The nucleus of a comet is surrounded by a diffuse cloud of gas and dust called the... | Coma |
| The Leonid meteor shower is named after the constellation Leo because the ... | meteors appear to come from the direction of the constellation Leo |
| Why are meteorties valuable to astronomers? | They may have played a critical role in supporting the evolution of life on Earth, they provide clues as to the org make up of the Earth's early atmosphere, they provided clues as to how our solar system was formed |
| True or False: There seems to be a link between the sunspot cycle and weather patterns on Earth. | True |
| True or False: The Sun is continuously losing mass due to nuclear reactions and to the solar wind. | True |
| __________ was the first astronomer to see sunspots through a telescope. | Galileo |
| The temperature on the Sun's surface is about __________ K. | 5800 |
| _________ is the transferance of thermal energy by solids in contact. | Conduction |
| ________ is the transferance of thermal energy by fluid. | Convection |
| ________ is the electromagnetic transfer of thermal energy. | Radiation |
| _________ is the balanced pressures in the Sun. | Hydrostatic |
| The _________ is the darkest part of the Sun's photosphere. | Limb |
| A _______ is a narrow jet of gas that comes off the sun. | Spicule |
| A ________ is a huge explosion on the sun. | Solar flare |
| ___________ are nuclear particles from the sun. | Solar wind |
| Does the Sun rotate as a solid? | No; point near the equator rotate in the least time |
| Fundamentally, solar energy comes from... | Nuclear fusion |
| "The rate at which electromagnetic energy is emitted" is a definition of.... | luminosity |
| Sunspots are... | cooler and darker than surrounding regions |
| The visible surface of the Sun is called the... | photosphere |
| What are the layers of the Sun, from inner to outer? | photosphere, chromosphere, corona |
| The _________ is the layer of the Sun that is visible during a total solar eclipse. | Corona |
| True or False: The nearest night star is also the brightest? | False - brigtness is determined by luminosity. the more luminous, the brighter, even if it is further away than ones that are closer but dimmer |
| True or False: A larger absolute magnitude number indicates a more luminous star? | False |
| Absolute magnitude is the apparent magnitude a star has if located ______ parsecs away from us. | 10 |
| The spectral type of our Sun is ______ | G2 |
| In the modern H-R diagram, 90% of the stars are on the ________ | Main Sequence |
| On the H-R diagram, O type stars are... | the hottest |
| On the H-R diagram, the M type stars are... | the coolest |
| On the H-R diagram, the F type stars are... | Closest to the Sun in color and size |
| Stars on the main sequence that have a great mass are.... | bright and hot |
| Red giants are more luminous than white dwarf stars because .... | red giants are much larger |
| We receive_________times as much energy from a star with an apparent magnitude of 3 as from one with an apparent magnitude of 5. | 6.25 - Formula: 5-3=2 (2 becomes the exponet to the base number 2.5) 2.5^2=6.25 |
| What determines the color of a star? | Its temperature |
Created by:
juret7674