មិនមានវាក្យសព្ទបែបនេះទេ។ សូមសាកល្បងមួយផ្សេងទៀត។

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Vocabulary Quiz:

1. stellar parallax

degree of stretching or lengthening

apparent shift due to Earth's movement

highest point in the sky directly overhead

sky visible during nighttime

2. meteor

measure of how elliptical an orbit is

stars that appear stationary from Earth's perspective

brightest star in the night sky

bright streak from atmospheric entry

3. hour angle

region visible from Earth

measure of time since last passage of a star crossing local meridian

outer layer surrounding a star

star's energy generated by gravitational contraction

4. brown dwarf

slow westward shift of rotational axis over time

failed star with insufficient mass for nuclear fusion

small planetary object

hot, ionized gas surrounding the galaxy

5. solar granule

star with features of different types

asteroid or comet close to Earth

related to stars

small convective cell on the Sun's surface

6. Fulton gap

mass range where exoplanets are rare

brightest star in the night sky

vast supercluster including the Milky Way

time span of observation

7. cosmic dust

tiny solid particles in space affecting light and heat

smaller galaxy orbiting a larger one

earth's orbit-based year length

Sun's apparent path

8. quadratic field strength

study of galaxies and their structures

spread of velocities in a system

variation proportional to square of position

galaxy collection including the Milky Way

9. parsec

unit of distance (~3.26 light-years)

large planet composed mainly of gases

shorthand notation for celestial objects or points

icy body with glowing tail when near the Sun

10. red-giant branch

phase of stellar evolution for large stars

Earth's atmosphere layer ionized by solar radiation

celestial body capable of nuclear fusion

contraction under gravity forming stars or structures

11. ascending node

star observed through Earth's atmosphere

planet closer to the Sun than Earth

study of celestial positions

point where orbit crosses celestial plane moving north

12. minor-planet moon

moon with no regular pattern or orbit

moon orbiting a minor planet

celestial body's companion (moon)

protoplanetary disk around a young star

13. Julian year

Moon blocks Sun from viewpoint on Earth

365.25 days in astronomical calendar

planet appears to move backward in sky

magnetic field associated with a star

14. molecular cloud

gas cloud with molecules, star-forming

orbit beyond Neptune

astronomical object catalog

slow westward shift of rotational axis over time

15. moving cluster

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

star used as reference for measurements or calibration

recognized pattern of stars forming mythic shapes

stars moving together through space

16. Messier object

pair of stars appearing close in the sky

365.25 days in astronomical calendar

deep-sky astronomical object catalog

point in orbit farthest from the sun or star

17. galactic astronomy

orbit with period equal to Earth's rotation

body similar to planets

study of motion of celestial bodies and spacecraft

study of galaxies and their structures

18. obliquity

axial tilt of a planet or star

another galaxy designation

longest or shortest day of the year

angular distance north or south of celestial equator

19. occultation

tilt of orbit's plane

object passes in front of a star

one celestial body blocking another

all existing matter and energy

20. field star

small moon orbiting a planet

imaginary line around which an object spins

study of universe's structure, origin, and evolution

star not part of a star cluster

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