Vocabulary Quiz - VocabForce

1. micrometeoroid

tiny space debris

measure of how elliptical an orbit is

observable boundary of the sky

study of celestial meridians

2. double star

edge of a celestial body's disk

pair of stars appearing close in the sky

closest distance a moon can approach without breakup

expanse of space visible from Earth's surface

3. break-up velocity

centered around the Sun

abundance of elements heavier than helium

velocity causing a celestial body to disintegrate

star's movement across the sky over time

4. solstice

alignment of three celestial bodies in a straight line

longest or shortest day of the year

speed moving along a circular path

celestial longitude coordinate

5. central massive object

gradual change in a celestial body's axis orientation

dense core exerting gravitational influence

mass of the Sun used as a standard unit

orbit aligning with a body's rotation

6. projected separation

time for a galaxy to complete an orbit

list of recorded stars and data

apparent distance between objects in view

projection of Earth's equator onto celestial sphere

7. magnitude

small, low-mass star, often red or brown

X-ray bright optically normal galaxy

measure of size or brightness

geology of planets and moons in the solar system

8. Am star

star with features of different types

minimum mass for hydrogen fusion in star

365.25 days in astronomical calendar

chemically peculiar star with strong metal lines

9. lunar phase

Moon's visible shape over a month

extremely large black hole at galaxy's core

table listing astronomical object positions over time

time based on Sun's position

10. small Solar System body

minor celestial object like asteroid or comet

intense burst of solar radiation

period between recurring celestial configurations

celestial longitude coordinate

11. O–C diagram

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

study of space-time ripples from massive bodies

observed minus calculated data

body similar to planets

12. geocenter

deep-sky astronomical object catalog

slow westward shift of rotational axis over time

center point of Earth's mass

tiny space debris

13. Hertzsprung–Russell diagram

faint glow from dust in solar system

graph plotting stars' brightness vs. temperature

small Solar System body between asteroids and comets

Earth's orbit period relative to stars

14. white dwarf

velocity of an orbiting object

remnant core of a dead star

celestial coordinate system based on Earth's equator

related to equinoxes or occurring at equinoxes

15. supernova

brightest star in the night sky

rapid fluctuation of star brightness

massive stellar explosion

region between Mars and Jupiter with numerous asteroids

16. geostationary orbit

orbit matching Earth's rotation, stationary relative to Earth

gradual change in a celestial body's axis orientation

imaginary sphere with stars fixed on its inside

angular distance north or south of celestial equator

17. planet

hypothetical dark matter candidate

slowing rotation via gravitational forces

large celestial body orbiting a star

celestial coordinate reference point in Libra

18. gravitational-wave astronomy

network or complex system of interconnected parts

study of space-time ripples from massive bodies

vernal equinox point marking celestial coordinates

star exhibiting multiple pulsation modes

19. stellar atmosphere

sun's outer atmosphere visible during eclipses

lowest point beneath observer

outer layer of a star

wobble in Earth's rotation axis

20. elongation

asteroid or comet close to Earth

mass range where exoplanets are rare

degree of stretching or lengthening

reflectivity of a celestial body based on geometry

Vocabulary Quiz:

1. micrometeoroid

2. double star

3. break-up velocity

4. solstice

5. central massive object

6. projected separation

7. magnitude

8. Am star

9. lunar phase

10. small Solar System body

11. O–C diagram

12. geocenter

13. Hertzsprung–Russell diagram

14. white dwarf

15. supernova

16. geostationary orbit

17. planet

18. gravitational-wave astronomy

19. stellar atmosphere

20. elongation

Select vocabulary category you want to browse:

Vocabulary Quiz:

1. micrometeoroid

2. double star

3. break-up velocity

4. solstice

5. central massive object

6. projected separation

7. magnitude

8. Am star

9. lunar phase

10. small Solar System body

11. O–C diagram

12. geocenter

13. Hertzsprung–Russell diagram

14. white dwarf

15. supernova

16. geostationary orbit

17. planet

18. gravitational-wave astronomy

19. stellar atmosphere

20. elongation

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