Vocabulary Quiz - VocabForce

1. planetary body

observed minus calculated data

orbit matching Earth's rotation, stationary relative to Earth

celestial objects like planets

flat surface containing orbit

2. solar eclipse

measure of transparency in stellar atmospheres

Moon blocks Sun from viewpoint on Earth

time when day and night are equal in length

deep-sky astronomical object catalog

3. horizon

central dense region of a spiral galaxy

great circle passing through celestial poles and a point

observable boundary of the sky

distant astronomical objects beyond solar system

4. two-body problem

motion of two gravitational bodies

celestial coordinates based on the ecliptic plane

categorization of stars by spectrum

small planet-like body orbiting the sun, not classified as planet

5. axial precession

slow westward shift of rotational axis over time

large celestial body orbiting a star

planet closer to the Sun than Earth

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

6. solar facula

leftover core after a star's death

free-floating planetary-mass object

bright area on the Sun's surface

method judging celestial distances with multiple steps

7. near-Earth object

study of universe's structure, origin, and evolution

asteroid or comet close to Earth

study of space-time ripples from massive bodies

perspective from Earth's surface

8. stellar classification

stable position in a two-body system

gas cloud with molecules, star-forming

celestial coordinate reference point in Libra

categorizing stars by spectra and brightness

9. Fulton gap

mass range where exoplanets are rare

star phase fusing hydrogen in core

use of diverse signals for study

point where Earth's axis intersects celestial sphere

10. lunar phase

closest star at galaxy's center of our solar system

brightest star in the night sky

Moon's visible shape over a month

stream of charged particles from Sun

11. galaxy cluster

star trail from gravitational stripping

wobble causing shifting equinox points over time

hot, blue, massive star with high surface temperature

group of multiple galaxies bound by gravity

12. ascending node

small star with brightness variation

point where orbit crosses celestial plane moving north

star not part of a star cluster

slow, continuous movement of celestial objects

13. relativistic jet

orbit following Kepler's laws, elliptical shape

star's movement across the sky over time

loss of light passing through Earth's atmosphere

high-speed jet from a galaxy or black hole

14. precession of the equinoxes

study of celestial meridians

celestial objects like planets

rotating disk of material around a young star

wobble causing shifting equinox points over time

15. argument of periapsis

angle from ascending node to periapsis in orbit

Sun's apparent path

orbit following Kepler's laws, elliptical shape

pair of stars appearing close in the sky

16. radio source

celestial coordinate reference point in Libra

very small meteorite in atmosphere

mass range where exoplanets are rare

emitting object detectable in radio wavelengths

17. magnetic switchback

body similar to planets

Sun-object-observer angle

angle from ascending node to periapsis in orbit

sudden magnetic field change in solar wind

18. declination

point directly above observer on Earth's center

outer layer surrounding a star

boundary where solar wind slows abruptly

angular distance north or south of celestial equator

19. syzygy

centered on Earth

gravitational effect on objects within a galaxy

deep-sky astronomical object catalog

alignment of three celestial bodies in a straight line

20. solar moss

relating to planets

dense stellar remnant like white dwarf or neutron star

categorizing stars by spectra and brightness

bright, fuzzy features on the Sun's surface

Vocabulary Quiz:

1. planetary body

2. solar eclipse

3. horizon

4. two-body problem

5. axial precession

6. solar facula

7. near-Earth object

8. stellar classification

9. Fulton gap

10. lunar phase

11. galaxy cluster

12. ascending node

13. relativistic jet

14. precession of the equinoxes

15. argument of periapsis

16. radio source

17. magnetic switchback

18. declination

19. syzygy

20. solar moss

Select vocabulary category you want to browse:

Vocabulary Quiz:

1. planetary body

2. solar eclipse

3. horizon

4. two-body problem

5. axial precession

6. solar facula

7. near-Earth object

8. stellar classification

9. Fulton gap

10. lunar phase

11. galaxy cluster

12. ascending node

13. relativistic jet

14. precession of the equinoxes

15. argument of periapsis

16. radio source

17. magnetic switchback

18. declination

19. syzygy

20. solar moss

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