# How many moons are in space?

sciftw | High School Teacher | (Level 1) Educator Emeritus

Posted on

Unfortunately, there isn't a specific number that I can give you regarding the number of moons in space.  The best answer is probably an infinite amount.  Space is hard to put limits of "space" on, because there is a difference between how many moons could be in the observable universe vs. how many moons are in the entire universe.  We have no idea how large the entire universe is (likely infinite), but we believe the observable universe to be in the ballpark of 92 billion light years in diameter.  Of course that number will continue to get bigger as more light from the expanding universe reaches us.

For "simplicity" let's just take the observable universe.  Stars are contained within giant clusters of stars called galaxies.  Galaxies contain hundreds of billions of starts and there are hundreds of billions of galaxies within the observable universe. That's a lot of stars.  Recently, astronomers released a statement/analysis that claims there is likely at least one planet orbiting each and every star. That's a lot of potential planets to have possible moons.

Not every planet is guaranteed to have a moon.  Mercury and Venus have none. But the remaining planets in our solar system have one or more. In fact NASA lists 146 confirmed moons in our solar system and 27 that are awaiting confirmation. That's an average of 24 moons per planet within our solar system. So if other stars have similar setups then the number of possible moons "in space" is more or less impossible to calculate.

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sid-sarfraz | Student, Graduate | (Level 2) Salutatorian

Posted on

Moon

The earth's natural satellite that shines by the sun's reflected light, revolves about the earth from west to east in about 291⁄2 days with reference to the sun or about 271⁄3 days with reference to the stars, and has a diameter of 2160 miles (3475 kilometers), a mean distance from the earth of about 238,900 miles (384,400 kilometers), and a mass about one eightieth that of the earth.

Moons -- also called satellites -- come in many shapes, sizes and types. They are generally solid bodies, and few have atmospheres. Most of the planetary moons probably formed from the discs of gas and dust circulating around planets in the early solar system.

Solar system

The Sun together with the nine planets, their moons, and all other bodies that orbit it, including asteroids, comets,meteoroids, and Kuiper belt objects. The outer limit of the solar system is formed by the   heliopause.

Number of moons in space:-

There are 166 natural satellites in our solar system. Moons divided amongst the planets:-

Mercury and Venus                 0.
Earth                                    1.
Mars                                     2.
Jupiter                                63.
Saturn                                60.
Uranus                                27.
Neptune                              13.

The number of known moos has been steadily growing with the improvement of technology.

Moons of our solar system

Earth
1. Earth's Moon

Mars
2. Phobos
3. Deimos

Jupiter
4. Io
5. Europa
6. Ganymede
7. Callisto
8. Amalthea
9. Himalia
10. Elara
11. Pasiphae
12. Sinope
13. Lysithea
14. Carme
15. Ananke
16. Leda
17. Thebe
19. Metis
20. Callirrhoe
21. Themisto
22. Megaclite
23. Taygete
24. Chaldene
25. Harpalyke
26. Kalyke
27. Iocaste
28. Erinome
29. Isonoe
30. Praxidike
31. Autonoe
32. Thyone
33. Hermippe
34. Aitne
35. Eurydome
36. Euanthe
37. Euporie
38. Orthosie
39. Sponde
40. Kale
41. Pasithee
42. Hegemone
43. Mneme
44. Aoede
45. Thelxinoe
46. Arche
47. Kallichore
48. Helike
49. Carpo
51. Cyllene
52. Kore
53. Herse

Saturn
54. Mimas
56. Tethys
57. Dione
58. Rhea
59. Titan
60. Hyperion
61. Iapetus
62. Erriapus
63. Phoebe
64. Janus
65. Epimetheus
66. Helene
67. Telesto
68. Calypso
69. Kiviuq
70. Atlas
71. Prometheus
72. Pandora
73. Pan
74. Ymir
75. Paaliaq
76. Tarvos
77. Ijiraq
78. Suttungr
79. Mundilfari
80. Albiorix
81. Skathi
82. Siarnaq
83. Thrymr
84. Narvi
85. Methone
86. Pallene
87. Polydeuces
88. Daphnis
89. Aegir
90. Bebhionn
91. Bergelmir
92. Bestla
93. Farbauti
94. Fenrir
95. Fornjot
96. Hati
97. Hyrrokkin
98. Kari
99. Loge
100. Skoll
101. Surtur
102. Greip
103. Jarnsaxa
104. Tarqeq
105. Anthe
106. Aegaeon

Uranus
107. Cordelia
108. Ophelia
109. Bianca
110. Cressida
111. Desdemona
112. Juliet
113. Portia
114. Rosalind
115. Mab
116. Belinda
117. Perdita
118. Puck
119. Cupid
120. Miranda
121. Francisco
122. Ariel
123. Umbriel
124. Titania
125. Oberon
126. Caliban
127. Stephano
128. Trinculo
129. Sycorax
130. Margaret
131. Prospero
132. Setebos
133. Ferdinand

Neptune
134. Triton
135. Nereid
137. Thalassa
138. Despina
139. Galatea
140. Larissa
141. Proteus
142. Halimede
143. Psamathe
144. Sao
145. Laomedeia
146. Neso

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rachellopez | Student, Grade 12 | (Level 1) Valedictorian

Posted on

We could never know exactly how many moons are in space, but there is a pretty good estimate for the moons just in our solar system. According to NASA, there are 146 confirmed moons in the solar system and 27 are waiting to be confirmed as moons. The moons of dwarf planets and the moons that orbit things like asteroids are not included. NASA's definition of a moon is as follows:

"They are generally solid bodies, and few have atmospheres. Most of the planetary moons probably formed from the discs of gas and dust circulating around planets in the early solar system."

It is likely more moons will be discovered in later years.

Sources:

ssandhu05 | Student, Undergraduate | (Level 2) Honors

Posted on

There's no real answer to that, since our universe is so large and ever-expanding that it would be hard to count or even estimate how many stars there are. However, we do know the number of moons that orbit each of the planets in our solar system, and how many total moons that is. There are 146 moons in our solar system, and many of those moons are Jupiter's moons. And only one of those moons is ours.