Vocabulary Quiz - VocabForce

1. star cluster

group of stars gravitationally bound

organized list of celestial objects

time for an object to complete one orbit relative to stars

speed at which star's equator becomes unstable

2. peak magnitude

secondary satellite orbiting a satellite

cool, less luminous star, often red

central dense region of a spiral galaxy

brightest apparent brightness

3. luminosity

boundary where magnetic forces balance plasma inertia

reflectivity of a surface, ratio of reflected to incident light

study of celestial meridians

total energy emitted by an object

4. sidereal day

Earth's rotation period relative to stars

gradual change in a celestial body's axis orientation

related to equinoxes or occurring at equinoxes

object not massive enough to be star

5. gravitational lens

minor celestial object like asteroid or comet

mass bends light from distant objects

moon orbiting a minor planet

acceleration due to gravity at Earth's surface

6. non-inclined orbit

small planetary object

distant icy body region beyond Neptune

orbit with zero inclination

part of Sun obscured

7. multiverse

measure of solar or stellar activity levels

theory of multiple universes

orbit aligning with a body's rotation

90-degree phase angle between celestial objects

8. Fulton gap

rotation speed leading to shape deformation or breakup

set of rings surrounding a planet

mass range where exoplanets are rare

closest point of Moon to Earth

9. spiral galaxy

temperature of a blackbody emitting the same radiation.

longest or shortest day of the year

galaxy with spiral arms structure

minimum speed to break planetary gravity

10. XBONG

small moon orbiting a planet

active galactic nucleus with jet pointing toward Earth

measure of star's color and temperature differences

X-ray bright optically normal galaxy

11. minor-planet moon

motion of two gravitational bodies

pair of stars appearing close in the sky

boundary where solar wind ceases

moon orbiting a minor planet

12. break-up velocity

distant astronomical objects beyond solar system

time taken for one orbit

velocity causing a celestial body to disintegrate

event marking start of fall in northern hemisphere

13. synodic period

celestial coordinates based on the ecliptic plane

time between consecutive alignments

distant icy body region beyond Neptune

region visible from Earth

14. precession

shorter diameter of an ellipse

curve representing stars of same age

hypothetical dark matter candidate

gradual change in a celestial body's axis orientation

15. binary star

galaxy with spiral arms structure

variation proportional to square of position

theory of multiple universes

system of two stars orbiting a common center

16. artificial satellite

human-made object orbiting a planet or star

rotating disk of matter spiraling into a celestial body

magnetic field associated with a star

loosely bound star group

17. cosmic distance ladder

method judging celestial distances with multiple steps

visible without telescope

distance light travels in one year

recognized pattern of stars forming mythic shapes

18. hypergalaxy

line dividing daylight and darkness

vast group of connected galaxies

large planet like Jupiter or Saturn

graph plotting stars' brightness vs. temperature

19. solar day

distance from Sun's center to surface

time from one sunrise to the next

wobble causing shifting equinox points over time

brightness change due to rotation

20. ionosphere

Earth's atmosphere layer ionized by solar radiation

measure of solar or stellar activity levels

study of galaxies and their structures

material around star from collisions or remnants

Vocabulary Quiz:

1. star cluster

2. peak magnitude

3. luminosity

4. sidereal day

5. gravitational lens

6. non-inclined orbit

7. multiverse

8. Fulton gap

9. spiral galaxy

10. XBONG

11. minor-planet moon

12. break-up velocity

13. synodic period

14. precession

15. binary star

16. artificial satellite

17. cosmic distance ladder

18. hypergalaxy

19. solar day

20. ionosphere

Select vocabulary category you want to browse:

Vocabulary Quiz:

1. star cluster

2. peak magnitude

3. luminosity

4. sidereal day

5. gravitational lens

6. non-inclined orbit

7. multiverse

8. Fulton gap

9. spiral galaxy

10. XBONG

11. minor-planet moon

12. break-up velocity

13. synodic period

14. precession

15. binary star

16. artificial satellite

17. cosmic distance ladder

18. hypergalaxy

19. solar day

20. ionosphere

Select vocabulary category you want to browse:

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