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B I A Stargazing Insights
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  1. benorin

    B The geometry of the expansion of space

    Sep 15, 2018
    5
    732
    Replies: 5
    4
  2. nmsurobert

    B High school Astro Club

    Sep 14, 2018
    2
    385
    Replies: 2
    4
  3. fab13

    I Variations in the speed of sound in a star

    Sep 12, 2018
    5
    461
    Replies: 5
    0
  4. DonutLord

    B Is right ascension only measured once a year?

    Sep 12, 2018
    6
    628
    Replies: 6
    4
  5. Prometeus

    I Is there some prediction of the speed of rings?

    Sep 11, 2018
    6
    581
    Replies: 6
    3
  6. Jenab2

    I How to get state vector in 4-observation method of Gauss

    Sep 10, 2018
    2
    382
    Replies: 2
    0
  7. Astroiaco

    I Astrophysics simple question about luminosity

    Sep 10, 2018
    7
    699
    Replies: 7
    3
  8. Leonardo Machado

    I Neutron Stars mass and radii observation data

    Sep 6, 2018
    1
    460
    Replies: 1
    0
  9. fizzy

    I 55x times harder to get to the Sun?

    Sep 4, 2018
    18
    1,646
    Replies: 18
    8
  10. kolleamm

    B The accelerating expansion of the universe

    Sep 4, 2018
    3
    677
    Replies: 3
    3
  11. Tom.G

    Stargazing Space Station Live Video of the Earth

    Sep 2, 2018
    6
    325
    Replies: 6
    2
  12. CookieSalesman

    A 3-star triangular orbit possible?

    Sep 1, 2018
    18
    1,037
    Replies: 18
    5
  13. rootone

    I Ecliptic plane

    Sep 1, 2018
    1
    300
    Replies: 1
    0
  14. James2018

    I Why don't red dwarf stars emit white light like the Sun?

    Aug 30, 2018
    9
    879
    Replies: 9
    2
  15. rootone

    I Synchronous orbits

    Aug 29, 2018
    11
    714
    Replies: 11
    3
  16. happyhacker

    B An observer looking at Earth's past history

    Aug 29, 2018
    3
    481
    Replies: 3
    1
  17. YoungPhysicist

    I Is the Sun a black body?

    Aug 28, 2018
    9
    730
    Replies: 9
    13
  18. tovisonnenberg

    B Brown Dwarfs

    Aug 27, 2018
    5
    449
    Replies: 5
    1
  19. shimun

    B Solar System Moving Speed

    ... 2 3
    Aug 26, 2018
    55
    2,976
    Replies: 55
    25
  20. Edeff

    B Are they still there?

    Aug 24, 2018
    6
    774
    Replies: 6
    7
  21. prodi

    I Radial dependence of the Sun's magnetic field

    Aug 23, 2018
    4
    474
    Replies: 4
    5
  22. Al_

    I Would going to the Moon delay going to Mars?

    ... 2
    Aug 21, 2018
    28
    1,135
    Replies: 28
    17
  23. AGuglielmone

    B Are all wavelengths of light possible?

    Aug 21, 2018
    8
    826
    Replies: 8
    0
  24. klotza

    Insights Either the Sun Is Getting Smaller or Gravity Is Getting Weaker

    ... 2
    Aug 19, 2018
    30
    3,839
    Replies: 30
    15
  25. DarkStar42

    I What problems would 'black holes' not being formed solve?

    ... 3 4 5
    Aug 19, 2018
    90
    3,892
    Replies: 90
    23
  26. sjp9220

    I Why are there so many different kinds of stars?

    ... 2
    Aug 18, 2018
    23
    1,048
    Replies: 23
    6
  27. nivamani Rajbongshi

    B Space: Color and Resources

    Aug 18, 2018
    5
    365
    Replies: 5
    3
  28. Auto-Didact

    A Penrose: CCC predicts BICEP2 B-modes due to void magnetic fields, correlated to CMB Hawking Points

    Aug 17, 2018
    6
    1,619
    Replies: 6
    2
  29. Cosmic Gazelle

    Front Seat to the Galaxy

    Aug 16, 2018
    3
    414
    Replies: 3
    0
  30. Andreza Carvalho

    I NASA Parker Solar spacecraft question

    Aug 14, 2018
    4
    408
    Replies: 4
    5
  31. jordankonisky

    I Phase of radio waves received by a radio telescope dish

    ... 2 3
    Aug 14, 2018
    56
    2,363
    Replies: 56
    33
  32. tovisonnenberg

    B Why don't high mass stars expand and cool?

    Aug 13, 2018
    8
    794
    Replies: 8
    1
  33. tovisonnenberg

    B Why will Betelgeuse go supernova?

    Aug 13, 2018
    9
    1,173
    Replies: 9
    2
  34. Delta2

    B Water colour in Mars

    Aug 10, 2018
    7
    702
    Replies: 7
    5
  35. DarkStar42

    I Would Newton's shell theorem prevent binary planet systems?

    Aug 8, 2018
    11
    777
    Replies: 11
    0
  36. nikkkom

    B Planet Nine race, how is it going?

    Aug 8, 2018
    10
    1,319
    Replies: 10
    4
  37. Suekdccia

    A Multiverse theory with impossible universes?

    Aug 8, 2018
    1
    446
    Replies: 1
    2
  38. CygnusX-1

    B Eta Carinae Is Farther Than You Thought: 8,500 Light-Years

    Aug 7, 2018
    1
    387
    Replies: 1
    1
  39. fizzy

    I A discussion on "officially called a planet"

    Aug 7, 2018
    3
    339
    Replies: 3
    2
  40. spossatamente

    A Emission line core in sunspots

    Aug 6, 2018
    2
    414
    Replies: 2
    0
  41. jim77

    I Solar system barycenter

    Aug 6, 2018
    13
    825
    Replies: 13
    7
  42. Kuzma

    Coordinates: Sun?

    Aug 5, 2018
    3
    422
    Replies: 3
    5
  43. Mikaelochi

    B A Question Concerning Lunar Eclipses and Aristarchus's Work

    Aug 4, 2018
    3
    308
    Replies: 3
    1
  44. DennisN

    Stargazing The Moon through my El Crapo Telescope

    Aug 2, 2018
    18
    1,083
    Replies: 18
    32
  45. tovisonnenberg

    B Neutron star collisions

    Aug 1, 2018
    3
    524
    Replies: 3
    0
  46. DarkStar42

    I Could entropy remain the same overall?

    Jul 31, 2018
    1
    347
    Replies: 1
    0
  47. Russell Patterson

    I Do orbital dynamics scale linearly?

    ... 2
    Jul 31, 2018
    23
    2,061
    Replies: 23
    2
  48. tovisonnenberg

    I Why does the expanding universe redshift light?

    Jul 31, 2018
    7
    531
    Replies: 7
    3
  49. Andrew Church

    I Composition of the Sun

    Jul 29, 2018
    10
    532
    Replies: 10
    2
  50. Tom.G

    I Relativity Confirmed Again

    Jul 29, 2018
    13
    565
    Replies: 13
    2
  51. Tom.G

    I Neptune images from VLT better than Hubble

    Jul 29, 2018
    3
    646
    Replies: 3
    5
  52. gmax137

    B Saturn's Rings Appearance from Saturn?

    Jul 28, 2018
    6
    533
    Replies: 6
    7
  53. jedishrfu

    B Attention: We have an important announcement from our Sun

    Jul 27, 2018
    4
    512
    Replies: 4
    4
  54. Sai Siddhartha k

    B General theory of relativity&Planet orbits

    Jul 27, 2018
    5
    421
    Replies: 5
    4
  55. Fewmet

    I Liquid water reservoir reported under Mars polar cap

    Jul 26, 2018
    4
    487
    Replies: 4
    0
  56. spossatamente

    I Stars with a hot corona

    Jul 25, 2018
    1
    370
    Replies: 1
    0
  57. greswd

    I Thoughts on Breakthrough Starshot?

    ... 2
    Jul 25, 2018
    22
    2,031
    Replies: 22
    7
  58. Simon Peach

    B Dark Matter

    ... 2 3
    Jul 23, 2018
    56
    2,717
    Replies: 56
    2
  59. DarkStar42

    A Do any coordinate systems include self magnification?

    Jul 23, 2018
    3
    399
    Replies: 3
    0
  60. DaTario

    I Why is the Moon getting further from Earth ?

    Jul 22, 2018
    5
    527
    Replies: 5
    0
  61. at94official

    Stargazing Help with how to start Stargazing

    ... 2
    Jul 22, 2018
    30
    1,262
    Replies: 30
    19
  62. Islam Hassan

    I Spherical Symmetry/Simultaneity of Supernova Explosions

    Jul 21, 2018
    8
    522
    Replies: 8
    5
  63. Spinnor

    I Accretion disc poloidal magnetic field, right or left hand rule?

    Jul 20, 2018
    1
    422
    Replies: 1
    0
  64. diogenesNY

    B NYTimes: 79 Moons of Jupiter and Counting

    Jul 20, 2018
    1
    339
    Replies: 1
    2
  65. redtree

    I Redshift and the Friedmann metric

    Jul 19, 2018
    9
    625
    Replies: 9
    0
  66. jedishrfu

    B Blazar as the Source of Cosmic Neutrinos Confirmed

    Jul 17, 2018
    8
    662
    Replies: 8
    4
  67. donielix

    I White dwarf collapses into a neutron star and Energy is released

    Jul 15, 2018
    9
    864
    Replies: 9
    1
  68. SlowThinker

    B Known properties and constraints of dark matter

    Jul 15, 2018
    11
    910
    Replies: 11
    4
  69. CygnusX-1
    Featured

    B First Interstellar Asteroid Found

    ... 5 6 7
    Jul 15, 2018
    124
    8,214
    Replies: 124
    37
  70. DaTario

    I Chemical Elements produced inside the Sun

    ... 2 3 4
    Jul 14, 2018
    65
    3,720
    Replies: 65
    9
  71. K. Doc Holiday

    B The Stefan-Boltzmann Law and Sunspots

    Jul 13, 2018
    2
    399
    Replies: 2
    1
  72. jim77

    I Solar geometry

    Jul 12, 2018
    9
    523
    Replies: 9
    11
  73. Islam Hassan

    I Mass Equivalence of Photon Content Inside the Sun?

    Jul 10, 2018
    12
    881
    Replies: 12
    11
  74. Stavros Kiri

    Stargazing Solar Activity and Space Weather Update thread

    ... 2 3
    Jul 10, 2018
    56
    4,203
    Replies: 56
    23
  75. monkey555

    A Question for Distant Retrograde Orbit in CR3BP

    Jul 5, 2018
    1
    399
    Replies: 1
    0
  76. BillTre

    I Image of a Newly Formed Planet in a Disk Around a Star

    Jul 4, 2018
    3
    503
    Replies: 3
    5
  77. spossatamente

    I Particle acceleration and kinetic energy

    Jul 4, 2018
    1
    280
    Replies: 1
    0
  78. sophiecentaur

    Stargazing Nebula filters

    ... 2
    Jul 4, 2018
    39
    2,278
    Replies: 39
    10
  79. GabrielLight

    I About gravitational binding energy and kinetic energy

    Jul 3, 2018
    11
    595
    Replies: 11
    1
  80. MeAndMyLucidLife

    B Why do most of the celestial bodies rotate about their axis?

    Jul 3, 2018
    10
    864
    Replies: 10
    5
  81. jk22

    B Equivalent gravitational forces in other galaxies

    Jun 29, 2018
    3
    468
    Replies: 3
    0
  82. BillTre
    Featured

    I Contoversy about NASA's Asteroid Tracking

    Jun 29, 2018
    19
    1,741
    Replies: 19
    23
  83. TeethWhitener

    B Oumuamua non-gravitational acceleration

    Jun 28, 2018
    1
    671
    Replies: 1
    3
  84. empleat

    B Please explain to me the 2d holographic universe

    Jun 27, 2018
    3
    553
    Replies: 3
    2
  85. Suekdccia

    B What is a non-real observer?

    Jun 26, 2018
    1
    341
    Replies: 1
    0
  86. Prof Sabi

    I How on Earth This is possible? (distance to a far galaxy)

    Jun 26, 2018
    4
    512
    Replies: 4
    3
  87. Gene Naden

    I How stellar aberration was quantified in the early days

    Jun 26, 2018
    5
    337
    Replies: 5
    0
  88. zuz

    I How do we get stars so much more massive than the Sun?

    Jun 24, 2018
    16
    3,746
    Replies: 16
    8
  89. Grinkle

    B History question -- The choice of the North Pole being up or down

    Jun 21, 2018
    18
    801
    Replies: 18
    4
  90. hyunxu

    B The Sun is cool or hot?

    ... 2 3
    Jun 20, 2018
    44
    3,918
    Replies: 44
    21
  91. Aidyan

    I Manned mission to Europa: science or still scifi?

    Jun 19, 2018
    8
    698
    Replies: 8
    13
  92. WeiShan Ng

    I Angular Diameter Distance

    Jun 19, 2018
    2
    476
    Replies: 2
    0
  93. All year camper

    B Explain my sightings

    Jun 19, 2018
    3
    806
    Replies: 3
    2
  94. exponent137

    I 2 second delay at the merger of two neutron stars in August 2017

    Jun 18, 2018
    4
    544
    Replies: 4
    1
  95. kolleamm

    Stargazing A good telescope with tracking for deep sky objects

    Jun 18, 2018
    17
    1,250
    Replies: 17
    16
  96. Sanborn Chase

    B Speed of Light in Dark Matter

    ... 2
    Jun 17, 2018
    29
    3,615
    Replies: 29
    14
  97. BillTre
    Featured

    Methane and Organic Molecules on Mars

    Jun 16, 2018
    18
    2,211
    Replies: 18
    10
  98. Sven E

    I Does the barycenter of the Earth-Moon system change?

    Jun 15, 2018
    2
    426
    Replies: 2
    0
  99. Baluncore

    B SOFIA IR Observatory in the Southern Sky.

    Jun 14, 2018
    4
    595
    Replies: 4
    1
  100. le chat

    I Shock crossing probability for isotropic particle flux

    Jun 14, 2018
    1
    545
    Replies: 1
    0
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