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Test your basic knowledge |
DSST Astronomy
Start Test
Study First
Subjects
:
dsst
,
science
Instructions:
Answer 42 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. The most precise measurement of Earth's rotation time.
300 -000 -000
Orion-Cygnus Arm
Newton's Laws
23:56
2. The speed of light in meters per second. It is also 300 -000 kilometers per second and 186 -000 miles per second.
Absorption Lines
Meteor
300 -000 -000
Lunar Month
3. Also called nuclear bulge - this is a swelling at the center of spiral galaxies. Bulges consist of old stars and extend out a few thousand light-years from the galactic centers.
Jovian Planets
Galactic Bulge
300 -000 -000
Parallax
4. The large - outer planets made of gas - Jupiter - Saturn - Uranus - & Neptune. These all have large moons and rings.
Red Giant
Globular Clusters
Jovian Planets
Population II Stars
5. The older - redder stars that populate a galaxy's hale and bulge. Low metallicity.
Ecliptic Plane
Terrestrial Planets
Population II Stars
Population I Stars
6. The name given to the four inner planets: Mercury - Venus - Earth - and Mars. Mercury and Venus lack moons.
Redshift
23:56
Calderas
Terrestrial Planets
7. A streak of light in the night sky that results when a meteoroid hits the earth's atmosphere - and air friction causes the meteoroid to melt or vaporize or explode.
300 -000 -000
Ecliptic Plane
Orion-Cygnus Arm
Meteor
8. An orbit that is backward or contrary to the orbital direction of the other planets.
Retrograde
Galileo Galilei
White Dwarf
Absorption Lines
9. Stage in which a star has used up its helium and its outer layers escape into space - leaving behind a hot - dense core that contracts.
Quasar
Equinox
White Dwarf
Lunar Month
10. The distance that light travels in one year; about 9.46 trillion kilometers.
Emission Line
Light Year
Comet
White Dwarf
11. 1. If no forces act on a body - its speed and direction of motion stay constant (an object in motion stays in motion - an object at rest stays at rest). 2. Force=mass x acceleration (F=ma). 3. When two bodies interact - they exert equal and opposite
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183
12. A cluster of stars (or a small constellation).
Asterism
Newton's Laws
Quasar
23:56
13. The dark lines in a spectrum where light of particular wavelengths has been absorbed.
Absorption Lines
Ecliptic Plane
Electromagnetic Spectrum
Emission Line
14. An immense cloud of gas (mainly hydrogen) and dust in interstellar space.
Nebula
Light Year
Galactic Bulge
300 -000 -000
15. Short for 'quasi-stellar radio source -' a bright - point-like object that produces the luminosity of 100 to 1 -000 galaxies within a region the size of a solar system.
Cepheid Variable
Lunar Month
Population I Stars
Quasar
16. Large - dense groupings of older stars held together by mutual gravitational attraction - which is what keeps them together longer than open clusters.
Ecliptic Plane
Calderas
23:56
Globular Clusters
17. A narrow - bright region of the spectrum - produced when electrons in atoms jump from one energy level to a lower energy level.
Emission Line
Electromagnetic Spectrum
Radio Galaxy
Globular Clusters
18. Large - hot - bright star late in the main sequence - having exhausted its hydrogen fuel. Its name comes from its color and size.
Blue Giant
23:56
Red Giant
Binary Star
19. A pair of stars held together by their mutual gravity and in orbit about each other which can be seen with a telescope as separate objects.
Seyfert Galaxy
Asterism
Nicolaus Copernicus
Binary Star
20. Polish astronomer who produced a workable heliocentric model of the solar system.
Radiation
Newton's Laws
Ecliptic Plane
Nicolaus Copernicus
21. A type of pulsating variable star that changes brightness in a regular and predicable manner - making it a useful 'standard candle' for learning absolute magnitudes.
Cepheid Variable
Comet
Nebula
White Dwarf
22. 'Failed' star; a star not massive enough to sustain nuclear fusion.
Redshift
Comet
Brown Dwarf
Orion-Cygnus Arm
23. A relatively small extraterrestrial body consisting of a frozen mass that travels around the Sun in a highly elliptical orbit.
Jovian Planets
Redshift
Comet
Radiation
24. The period between successive new moons (29.531 days).
Absorption Lines
Lunar Month
Galactic Bulge
Ecliptic Plane
25. Either of the two celestial points at which the celestial equator intersects the ecliptic plane.
23:56
Solstice
Equinox
Terrestrial Planets
26. Either of the two times of the year when the Sun is at its greatest distance from the celestial equator.
Solstice
Doppler Effect
Pulsar
Calderas
27. Italian astronomer and mathematician who was the first to use a telescope to study the stars.
Asterism
Comet
Galileo Galilei
Emission Line
28. A shift in the lines of an object's spectrum toward the red end. It indicates that an object is moving away from the observer. The larger it is - the faster the object is moving.
Nebula
Redshift
Population II Stars
Meteor
29. Areas on the sun's surface that are cooler and less bright than surrounding areas - are caused by the sun's magnetic field - and occur in cycles.
Electromagnetic Spectrum
Solstice
Sunspots
Brown Dwarf
30. Type of active galaxy whose emissions come from a very small region within the nucleus of an otherwise normal-looking spiral system.
Globular Clusters
Ecliptic Plane
Seyfert Galaxy
Galileo Galilei
31. The portion of the Milky Way in which our solar system resides.
Newton's Laws
Orion-Cygnus Arm
Asterism
Radiation
32. Energy that is radiated or transmitted in the form of rays or waves or particles.
Radiation
Retrograde
Orion-Cygnus Arm
Neutron Star
33. The younger stars - some of which are blue - that populate a galaxy's disk - especially its spiral arms. High in heavy metals.
Ecliptic Plane
Newton's Laws
Population I Stars
Light Year
34. The plane of the Earth's orbit around the Sun.
Ecliptic Plane
Solstice
Pulsar
Nebula
35. The small - dense remains of a high-mass star after a supernova.
Pulsar
Lunar Month
Equinox
Neutron Star
36. Very bright - often giant - elliptical galaxy type that emits as much or more energy in the form of radio wavelengths as it does wavelengths of visible light.
Radio Galaxy
Galileo Galilei
Nicolaus Copernicus
Population II Stars
37. Depressions that form when a volcano collapses - as opposed to craters formed by meteoroid impact.
Radiation
Calderas
Comet
Doppler Effect
38. A rapidly rotating neutron star which emits radiation in magnetic pulses.
Cepheid Variable
300 -000 -000
Equinox
Pulsar
39. A change in the apparent frequency of a wave - as observer and source move toward or away from each other.
Electromagnetic Spectrum
Parallax
Light Year
Doppler Effect
40. The apparent displacement of an object as seen from two different points that are not on a line with the object.
Light Year
Sunspots
Nicolaus Copernicus
Parallax
41. A star that expands and cools once it runs out of hydrogen fuel.
Orion-Cygnus Arm
White Dwarf
Calderas
Red Giant
42. Arrangement of electromagnetic radiation--including radio waves - visible light - gamma rays - X-rays - ultraviolet waves - infrared waves - and microwaves--according to their wavelengths.
Electromagnetic Spectrum
Cepheid Variable
Parallax
Orion-Cygnus Arm