Vocabulary Quiz - VocabForce

1. descending node

shorthand notation for celestial objects or points

recognizable pattern of stars within a constellation

point where orbit crosses celestial plane heading south

asteroid or comet close to Earth

2. massive compact halo object

study of cosmic dust and its effects

angle from ascending node to periapsis in orbit

hypothetical dark matter candidate

free-floating planet not orbiting a star

3. planetology

bright, dense center of a galaxy

the study of planets

Earth's natural satellite

asteroid sharing orbit with a planet

4. gas giant

stars sharing common motion

apparent distance between objects in view

large planet composed mainly of gases

graph plotting stars' brightness vs. temperature

5. solar time

star system identified via precise position measurements

time based on Sun's position

study of celestial positions

gravity stretching objects due to nearby masses

6. astronomical body

orbit following Kepler's laws, elliptical shape

reflectivity of a celestial body based on geometry

natural object in space, like planets or stars

time taken for one orbit

7. orbit plot

graph representing orbital motion

star and orbiting bodies

astronomical color measurement system

star with changing brightness

8. first magnitude star

brightest star in the night sky

point where orbit crosses ecliptic

star system identified via precise position measurements

study of celestial objects via radio waves

9. minor planet

large planet with icy composition, e.g., Neptune

point directly above observer on Earth's center

small planetary object orbiting Sun

study of planets

10. rotational modulation

galaxy collection including the Milky Way

brightness change due to rotation

centered on the Sun

moon orbiting a minor planet

11. lobster-eye optics

highest point in satellite orbit around Earth

flat surface containing orbit

wide-angle imaging for X-ray telescopes

large, bright cloud of plasma in Sun's atmosphere

12. planetary nebula

expanding gas around dying star

small convective cell on the Sun's surface

small planetary object

compass angle of an object from a reference direction

13. orbital elements

lowest point beneath observer

visible distribution of stars in the sky

parameters defining an orbit

star exhibiting sudden brightness increases

14. thin disk population

average distance from Earth to Sun (about 149.6 million km)

stars in a galaxy's flat disk

vernal equinox point marking celestial coordinates

smaller galaxy orbiting a larger one

15. critical rotation

galaxy luminosity and rotation link

study of planets

rotation speed leading to shape deformation or breakup

apparent movement of celestial objects along the sky

16. weak-line star

high-energy particles from space impacting Earth

stellar explosion increasing brightness

star with faint spectral lines

categorization of stars by spectrum

17. zodiacal light

set of rings surrounding a planet

star exhibiting multiple pulsation modes

faint glow from dust in solar system

abundance of elements heavier than helium

18. syzygy

free-floating planet not orbiting a star

alignment of three celestial bodies in a straight line

X-ray bright optically normal galaxy

intense burst of solar radiation

19. metallicity

apparent distance between objects in view

spatial extent of morning astronomical phenomena

time measure in orbital mechanics

abundance of elements heavier than helium

20. astrometry

celestial objects like planets

angular distance north or south of celestial equator

measurement of celestial object positions and motions

point where orbit crosses celestial plane heading south

Vocabulary Quiz:

1. descending node

2. massive compact halo object

3. planetology

4. gas giant

5. solar time

6. astronomical body

7. orbit plot

8. first magnitude star

9. minor planet

10. rotational modulation

11. lobster-eye optics

12. planetary nebula

13. orbital elements

14. thin disk population

15. critical rotation

16. weak-line star

17. zodiacal light

18. syzygy

19. metallicity

20. astrometry

Select vocabulary category you want to browse:

Vocabulary Quiz:

1. descending node

2. massive compact halo object

3. planetology

4. gas giant

5. solar time

6. astronomical body

7. orbit plot

8. first magnitude star

9. minor planet

10. rotational modulation

11. lobster-eye optics

12. planetary nebula

13. orbital elements

14. thin disk population

15. critical rotation

16. weak-line star

17. zodiacal light

18. syzygy

19. metallicity

20. astrometry

Select vocabulary category you want to browse:

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