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  1. CygnusX-1

    B Earth may owe its birth to a solar eruption

    May 12, 2017

    3

    3
    Replies: 3
  2. Kara386

    I What causes ring current?

    May 12, 2017

    2

    0
    Replies: 2
  3. GTOM

    B Survival on Mars?

    ... 13
    May 10, 2017

    259

    45
    Replies: 259
  4. Arman777

    I Sun's Magnetic Field, Global Warming

    May 9, 2017

    10

    0
    Replies: 10
  5. RyuuJin

    A Gravitational waves: effect of frequency on strain

    May 9, 2017

    4

    0
    Replies: 4
  6. Sullivan Stockwell

    B The Early Universe and the Laws of Physics

    May 8, 2017

    1

    0
    Replies: 1
  7. FritoTaco

    Should we invest in Mars Exploration

    ... 10
    May 8, 2017

    186

    86
    Replies: 186
  8. Pyrus

    B How do we define "space"?

    May 7, 2017

    6

    3
    Replies: 6
  9. rootone

    I Are quark stars a realistic solution to the black hole singularity problem?

    May 7, 2017

    6

    1
    Replies: 6
  10. Cristiano

    I Sun elevation for ISS visibility

    May 7, 2017

    2

    0
    Replies: 2
  11. Chronos

    I Testing the information loss problem

    May 7, 2017

    2

    0
    Replies: 2
  12. Zahid Hasan

    I How far out are the probes that were sent out

    ... 2
    May 6, 2017

    29

    15
    Replies: 29
  13. hsdrop

    B The Earth's magnetic field and moon

    May 5, 2017

    11

    4
    Replies: 11
  14. bender_the_great

    I Time-travel and space displacement

    May 3, 2017

    2

    0
    Replies: 2
  15. sophiecentaur

    Stargazing How is the dark hole formed?

    Apr 30, 2017

    7

    2
    Replies: 7
  16. Guilherme Franco

    I Where to find in-depth info about each star's composition?

    Apr 30, 2017

    1

    0
    Replies: 1
  17. DWT

    I How do we know we are looking back in time in space?

    ... 2
    Apr 30, 2017

    25

    7
    Replies: 25
  18. RyuuJin

    A Distrubution of cosmic rays

    Apr 30, 2017

    6

    0
    Replies: 6
  19. CygnusX-1

    B Super-Earth Found in Habitable Zone of Nearby Red Dwarf

    Apr 29, 2017

    13

    6
    Replies: 13
  20. lifeonmercury
    Featured

    Why colonize Mars and not the Moon?

    ... 41
    Apr 29, 2017

    816

    283
    Replies: 816
  21. Ranku

    I Electron degeneracy pressure

    Apr 29, 2017

    19

    3
    Replies: 19
  22. JayFlynn

    Why use Earth as a gravity assist?

    Apr 27, 2017

    8

    1
    Replies: 8
  23. Allen_Wolf

    B Hawking radiation

    Apr 27, 2017

    1

    0
    Replies: 1
  24. Glenn G

    B Aristotle and geocentric

    Apr 26, 2017

    5

    0
    Replies: 5
  25. madison bond

    B Eccentricity of orbits

    Apr 25, 2017

    6

    0
    Replies: 6
  26. JohnnyGui

    I Questions about the lifecycle of stars

    ... 4
    Apr 24, 2017

    77

    15
    Replies: 77
  27. Jamison Lahman

    I Are White Dwarfs Stars?

    ... 2
    Apr 22, 2017

    33

    9
    Replies: 33
  28. Go Nucelar

    B Adding a huge electric charge to a black hole?

    ... 2
    Apr 21, 2017

    30

    6
    Replies: 30
  29. BillTre

    B New NASA Image Library

    Apr 20, 2017

    1

    5
    Replies: 1
  30. hsdrop

    Stargazing The best view for 2014jo25

    Apr 19, 2017

    6

    5
    Replies: 6
  31. Arac15

    A Micrometeorites and Karman effect

    Apr 17, 2017

    1

    0
    Replies: 1
  32. Jarvis323

    B Where have we looked, or are looking, for life?

    Apr 17, 2017

    9

    4
    Replies: 9
  33. Solkar

    A Spectral Classification Syntax for Binaries

    Apr 17, 2017

    7

    1
    Replies: 7
  34. Avimanyu Ray

    I Why does the Earth rotate?

    Apr 16, 2017

    8

    1
    Replies: 8
  35. Dmstifik8ion

    Stargazing Apparent vs actual position of stars

    Apr 14, 2017

    10

    3
    Replies: 10
  36. Edward Barrow

    I Is a superflare capable of changing a planets orbit?

    Apr 14, 2017

    18

    3
    Replies: 18
  37. Trainee Engineering

    I Can we predict the Sun's path accurately?

    Apr 14, 2017

    10

    3
    Replies: 10
  38. TreeLover

    B An exercise related to the mass of the Milky Way, sort of.

    Apr 12, 2017

    2

    0
    Replies: 2
  39. BOAS

    I Considerations for size of telescope survey

    Apr 12, 2017

    2

    0
    Replies: 2
  40. Althistorybuff

    I Question about a magnetic dynamo on tidally locked moons

    Apr 11, 2017

    7

    0
    Replies: 7
  41. Dovla

    I Defending the Earth from meteors using lasers

    ... 3
    Apr 11, 2017

    44

    5
    Replies: 44
  42. Althistorybuff

    I Tides on a nearly tidally locked planet

    Apr 9, 2017

    7

    2
    Replies: 7
  43. John Morrell

    I Zero G health risk

    Apr 9, 2017

    1

    0
    Replies: 1
  44. Greg Bernhardt

    Insights Q&A With Universe Today's Fraser Cain - Comments

    Apr 7, 2017

    4

    5
    Replies: 4
  45. Vivek Siddarth K

    B Big Bang expansion question

    Apr 6, 2017

    3

    1
    Replies: 3
  46. Tim Layton

    B Finding a black hole

    Apr 6, 2017

    2

    1
    Replies: 2
  47. BernieM

    I Observation of photons from CMB by different observers

    Apr 6, 2017

    7

    0
    Replies: 7
  48. Nabin kalauni

    How do black holes attract light?

    Apr 6, 2017

    8

    5
    Replies: 8
  49. Al_

    I Where on the Moon should the first Moonbase be?

    ... 2
    Apr 5, 2017

    32

    8
    Replies: 32
  50. CosmologyHobbyist

    B Radar & Jupiter Great Red Spot

    Apr 4, 2017

    1

    1
    Replies: 1
  51. Jerky Jesse

    A What is the formula for calculating the Ascendant?

    Apr 4, 2017

    1

    0
    Replies: 1
  52. Singlau

    B Black hole mass and sigma (velocity dispersion)

    Apr 2, 2017

    5

    0
    Replies: 5
  53. lifeonmercury

    B Hellas Basin

    Mar 31, 2017

    10

    1
    Replies: 10
  54. kolleamm

    B A good quality telescope?

    Mar 30, 2017

    18

    6
    Replies: 18
  55. SteveO33

    I Explain the orbital physics of the JAXA Tether experiment?

    ... 4
    Mar 29, 2017

    77

    18
    Replies: 77
  56. Edward Barrow

    I Would the rogue planet in this picture slow Earths spin?

    Mar 29, 2017

    14

    5
    Replies: 14
  57. ElPimiento

    I How is it that the SPH cubic spline kernel in normalized?

    Mar 28, 2017

    1

    0
    Replies: 1
  58. Shubham Jaydeokar

    A Space Radio Software

    Mar 28, 2017

    2

    1
    Replies: 2
  59. Althistorybuff

    I Length of lunar month immediately after moon's formation?

    Mar 28, 2017

    1

    0
    Replies: 1
  60. Sherwood Botsford

    I Can a planet have multiple large moons?

    Mar 28, 2017

    1

    0
    Replies: 1
  61. Colm

    B If the universe is expanding at an accelerating rate...

    Mar 27, 2017

    3

    2
    Replies: 3
  62. Colm

    B How do we know the stars are not our own light falling back.

    Mar 27, 2017

    4

    1
    Replies: 4
  63. Sherwood Botsford

    A How is the Trappist 1 system stable?

    Mar 27, 2017

    6

    1
    Replies: 6
  64. AT36

    A Orbit estimation

    Mar 27, 2017

    3

    0
    Replies: 3
  65. jamespompey2109

    I Mass and temperature relation in stars

    Mar 27, 2017

    5

    0
    Replies: 5
  66. Gerinski

    A Is the matter-antimatter annihilation observable in priciple

    Mar 27, 2017

    1

    0
    Replies: 1
  67. rmpearlman

    Cosmological Redshift distance to where it begins?

    Mar 27, 2017

    5

    4
    Replies: 5
  68. Ben S

    I Newtonian Gravity Simulator

    Mar 25, 2017

    7

    4
    Replies: 7
  69. snorkack

    I Lepton number of the Universe

    Mar 23, 2017

    1

    0
    Replies: 1
  70. nomadreid

    I Clusters at center and periphery

    Mar 23, 2017

    2

    0
    Replies: 2
  71. Robert Scott

    I What causes the deceleration of a satellite? Space dust?

    Mar 22, 2017

    4

    6
    Replies: 4
  72. lifeonmercury

    B Artic circle on the Moon

    Mar 21, 2017

    1

    0
    Replies: 1
  73. Nick Levinson

    B How fast is Earth traveling due to the Hubble constant?

    ... 3
    Mar 21, 2017

    43

    13
    Replies: 43
  74. Steven Hansel

    I Will interstellar travel become more possible in future

    ... 2
    Mar 21, 2017

    22

    14
    Replies: 22
  75. Al_

    I On the Moon, could you melt dirt by focussing sunlight?

    Mar 21, 2017

    1

    0
    Replies: 1
  76. nomadreid

    I Why are Lagrange points called libration points, and....

    Mar 21, 2017

    4

    2
    Replies: 4
  77. janq

    I Big rip - order of distintegration?

    Mar 20, 2017

    1

    0
    Replies: 1
  78. Jay Suh

    B Are Black Holes just stars?

    Mar 20, 2017

    7

    0
    Replies: 7
  79. lifeonmercury

    B The clouds of Venus

    Mar 20, 2017

    12

    3
    Replies: 12
  80. lifeonmercury

    B What would happen to the Moon if (at full moon) the Earth disappeared?

    Mar 20, 2017

    7

    1
    Replies: 7
  81. Steven Hansel

    B How do you know the size/maximum area of a gravity field

    Mar 20, 2017

    4

    2
    Replies: 4
  82. Enis

    B What are the applications of solar sails?

    Mar 18, 2017

    1

    0
    Replies: 1
  83. Veles

    A M-sigma vs. M-M_bulge relationship

    Mar 18, 2017

    1

    0
    Replies: 1
  84. jack h

    B Need Martian Regolith/Soil Simulant. JSC Mars-1

    Mar 18, 2017

    2

    1
    Replies: 2
  85. akashpandey

    I Spin or rotation of moon?

    Mar 18, 2017

    10

    3
    Replies: 10
  86. virgil1612

    I Rocky planets around red dwarfs

    Mar 17, 2017

    4

    2
    Replies: 4
  87. Al_

    I Can we colonize the Kuiper Belt?

    Mar 17, 2017

    11

    2
    Replies: 11
  88. mohau tshekoeng

    B What are the chances of evolution of organisms in space

    Mar 16, 2017

    3

    0
    Replies: 3
  89. infinitebubble

    I Guarding Mars' atmosphere with a magnetic shield

    ... 2
    Mar 14, 2017

    24

    2
    Replies: 24
  90. Tahmeed

    I Effect of planetary layer densities on trajectories of a satellite

    Mar 13, 2017

    1

    0
    Replies: 1
  91. Simon Peach

    B How can gravity act on a photon?

    Mar 13, 2017

    4

    4
    Replies: 4
  92. Bammitzcam

    B Light Travel Time

    Mar 12, 2017

    6

    2
    Replies: 6
  93. Glenn G

    B Cosmological redshift

    Mar 12, 2017

    3

    1
    Replies: 3
  94. infinitebubble

    Stargazing SECCHI Image of object?

    Mar 11, 2017

    4

    4
    Replies: 4
  95. BillTre

    B What Saturn’s moon, Pan looks like

    Mar 10, 2017

    1

    4
    Replies: 1
  96. jim mcnamara

    I FRB's as power for light sails

    Mar 10, 2017

    1

    1
    Replies: 1
  97. Cindy Hops

    How can neutron stars have magnetospheres?

    Mar 9, 2017

    6

    1
    Replies: 6
  98. Leonardo Machado

    A Neutron Star EoS

    Mar 9, 2017

    3

    1
    Replies: 3
  99. mesa

    B What is the vacuum at the Karman line?

    Mar 8, 2017

    1

    0
    Replies: 1
  100. Alanay

    B Are black holes perfect spheres?

    Mar 8, 2017

    14

    5
    Replies: 14
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