100 Words Related to Space

100 Words Related to Space

No. Term Definition
1. Ablation Erosion from intense heat during reentry.
2. Airlock Chamber for entering or leaving spacecraft.
3. Altitude Height above a reference level.
4. Antenna Device for transmitting or receiving signals.
5. Aphelion Farthest point from the Sun.
6. Apoapsis Farthest point in an orbit.
7. Apparent magnitude Brightness of an object as seen.
8. Asteroid Small rocky body orbiting the Sun.
9. Astrobiology Study of life in the universe.
10. Astronaut Person trained for space travel.
11. Black hole Region where gravity prevents light escape.
12. Booster Rocket stage providing extra thrust.
13. Bubble universe Hypothetical separate region of spacetime.
14. Cargo capsule Uncrewed craft carrying supplies to orbit.
15. Celestial sphere Imaginary sky dome for mapping objects.
16. Comet Icy body forming a tail near Sun.
17. Constellation Recognized pattern of stars in the sky.
18. Cosmic dust Tiny particles drifting through space.
19. Cosmic microwave background Faint afterglow radiation of the Big Bang.
20. Cosmic ray High-energy particle from space.
21. Cryogenic fuel Very cold liquid rocket propellant.
22. Dark matter Invisible matter inferred from gravity.
23. Deep space Space far beyond Earth orbit.
24. Delta-v Change in velocity needed for maneuvers.
25. Docking Joining two spacecraft in space.
26. Dwarf planet Round body not clearing its orbit.
27. Eclipse One body blocks light from another.
28. Ecliptic Plane of Earth’s orbit around Sun.
29. Escape velocity Speed needed to leave a body’s gravity.
30. Exoplanet Planet orbiting a star beyond the Sun.
31. Extravehicular activity Work done outside a spacecraft.
32. Flare Sudden bright outburst from a star.
33. Flyby Close pass to observe or gain speed.
34. Fuselage Main body of a spacecraft or plane.
35. G-force Acceleration felt relative to gravity.
36. Galaxy Vast system of stars and gas.
37. Gamma-ray burst Brief intense burst of gamma radiation.
38. Geosynchronous orbit Orbit matching Earth’s rotation period.
39. Gravitational lensing Light bending by massive objects.
40. Gravity assist Using a planet to change trajectory.
41. Habitable zone Region where liquid water may exist.
42. Heat shield Protective layer for atmospheric entry.
43. Heliosphere Bubble of solar wind around Sun.
44. Hubble Space Telescope Orbiting telescope observing deep space.
45. Ignition Start of rocket engine combustion.
46. Inclination Tilt of an orbit relative to a plane.
47. Interstellar medium Gas and dust between stars.
48. Ion drive Engine using ions for low thrust.
49. Jet propulsion Thrust produced by expelling mass.
50. Jovian planet Large gas giant like Jupiter.
51. Kuiper Belt Region of icy bodies beyond Neptune.
52. Lagrange point Stable gravitational balance point in space.
53. Landing gear Structures supporting a landing vehicle.
54. Launch pad Platform where rockets lift off.
55. Light-year Distance light travels in one year.
56. Lunar eclipse Earth’s shadow falls on the Moon.
57. Lunar module Spacecraft designed to land on Moon.
58. Magnetosphere Region dominated by a planet’s magnetic field.
59. Manned mission Space mission carrying humans.
60. Mars rover Robot vehicle exploring Mars surface.
61. Mass driver Electromagnetic launcher for payloads.
62. Meteor Streak of light from burning debris.
63. Meteorite Space rock that reaches the ground.
64. Microgravity Near-weightless condition in orbit.
65. Milky Way Galaxy containing our Solar System.
66. Mission control Ground team directing a space mission.
67. Nebula Cloud of gas and dust in space.
68. Neutron star Extremely dense remnant of a supernova.
69. Nova Sudden brightening of a star system.
70. Nuclear thermal rocket Rocket heated by a nuclear reactor.
71. Occultation Object hidden by another passing in front.
72. Oort Cloud Distant reservoir of long-period comets.
73. Orbit Curved path around a body due to gravity.
74. Orbital period Time to complete one orbit.
75. Parallax Apparent shift from different viewpoints.
76. Payload Cargo carried by a rocket or spacecraft.
77. Periapsis Closest point in an orbit.
78. Perihelion Closest point to the Sun.
79. Photon Particle of light.
80. Planet Large body orbiting a star.
81. Plasma Ionized gas common in space.
82. Probe Uncrewed craft sent to explore.
83. Propellant Substance expelled to produce thrust.
84. Pulsar Rotating neutron star emitting regular pulses.
85. Radiation belt Trapped charged particles around a planet.
86. Radio telescope Instrument detecting radio waves from space.
87. Reentry Return through an atmosphere from space.
88. Retrograde Motion opposite a body’s usual rotation.
89. Rocket Vehicle propelled by expelling exhaust.
90. Rover Mobile robot exploring a planetary surface.
91. Satellite Object orbiting a planet or star.
92. Solar flare Sudden eruption of energy from the Sun.
93. Solar panel Device converting sunlight into electricity.
94. Solar sail Propulsion using pressure of sunlight.
95. Solar system Sun and all objects orbiting it.
96. Space debris Human-made junk orbiting Earth.
97. Space station Habitable structure in orbit.
98. Spacesuit Protective suit for space environment.
99. Spectroscopy Analyzing light to identify materials.
100. Star Luminous sphere of hot plasma.