IVOAT Thesaurus

  1. O USE oxygen
  2. O association
  3. O cluster
  4. O dwarf
  5. O giant
  6. O magnitude
  7. O star
  8. O subdwarf
  9. O supergiant
  10. O-association USE O association
  11. OB association
  12. OB star
  13. OB supergiant
  14. objective
  15. objective grating
  16. objective prism
  17. oblateness
  18. oblique rotator
  19. obliquity USE obliquity of ecliptic
  20. obliquity of ecliptic
  21. observation
  22. observational cosmology
  23. observatory
  24. observing technique
  25. occultation
  26. occulting disk
  27. ocean tide
  28. oceanography
  29. Oe star
  30. Oef star
  31. Of star
  32. OH USE hydroxyl radical
  33. OH absorption
  34. OH cloud
  35. OH emission
  36. OH IR star
  37. OH line
  38. OH maser
  39. OH radical USE hydroxyl radical
  40. OH source
  41. OH-IR star USE OH IR star
  42. old star
  43. Omega baryon
  44. Omega Lambda
  45. Omega mass
  46. Omega parameter
  47. Omega(baryon) USE Omega baryon
  48. Omega(Lambda) USE Omega Lambda
  49. Omega(mass) USE Omega mass
  50. omicron Ceti star USE Mira variable star
  51. on line system USE on-line system
  52. on-line system
  53. Oort cloud
  54. Oort comet cloud USE Oort cloud
  55. Oort constant
  56. Oort formulae
  57. Oort formulas USE Oort formulae
  58. Oosterhoff group
  59. opacity
  60. open star cluster
  61. open universe
  62. Opik theory
  63. opposition
  64. optical aberration
  65. optical burst
  66. optical component
  67. optical counterparts USE optical identification
  68. optical depth
  69. optical design
  70. optical double star
  71. optical equipment USE optical instrument
  72. optical fiber
  73. optical film
  74. optical filter
  75. optical flare
  76. optical glass
  77. optical identification
  78. optical instrument
  79. optical interferometer
  80. optical interferometry
  81. optical material
  82. optical observation
  83. optical observatory
  84. optical outburst
  85. optical pathlength
  86. optical position
  87. optical property
  88. optical pulsar
  89. optical radar
  90. optical scanners
  91. optical spectrograph
  92. optical spectrometer USE optical spectrograph
  93. optical spectroscopy
  94. optical surface
  95. optical system
  96. optical telescope
  97. optical testing
  98. optical thickness USE optical depth
  99. optical transfer function
  100. optical transmission window
  101. optical waveguide
  102. optical window
  103. optics
  104. orbit
  105. orbit determination
  106. orbital anomaly
  107. orbital element
  108. orbital evolution
  109. orbital motion
  110. orbital theory
  111. orbital velocity
  112. orbiting observatory USE space observatory
  113. organic matter
  114. organic molecule
  115. orientation
  116. origin
  117. orion population star
  118. orrery
  119. orthohydrogen
  120. orthoscopic eyepiece
  121. Os USE osmium
  122. oscillating universe
  123. oscillation
  124. oscillator strength
  125. osculating orbit
  126. osculatory element
  127. osmium
  128. OTF USE optical transfer function
  129. outburst
  130. outer planet
  131. outgassing
  132. overabundance
  133. overtone frequency
  134. overtone mode
  135. overtones USE overtone frequency
  136. overtones USE overtone mode
  137. oxygen
  138. oxygen burning
  139. ozone layer