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B I A Stargazing Insights
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  1. Jeon

    A Galaxy mass distribution without DM

    Feb 17, 2018
    9
    1,199
    Replies: 9
    0
  2. alantheastronomer

    Virial thereom as applied to clusters of galaxies

    Feb 16, 2018
    2
    526
    Replies: 2
    0
  3. Space_Girl

    Stargazing Eclipse (Feb,15 2018)

    Feb 14, 2018
    6
    479
    Replies: 6
    6
  4. Alec Dacyczyn

    I Changing the ISS's orbital inclination to match the Moon

    Feb 12, 2018
    4
    533
    Replies: 4
    0
  5. Al_

    I Moon Poles: Which is better?

    ... 2
    Feb 12, 2018
    33
    1,498
    Replies: 33
    4
  6. |Glitch|

    I New White Dwarf Mass Limit

    Feb 11, 2018
    9
    492
    Replies: 9
    5
  7. Martin Peasha

    B Could we launch spaceships from a long horizontal ramp?

    Feb 11, 2018
    2
    464
    Replies: 2
    1
  8. Go Nucelar

    B Adding a huge electric charge to a black hole?

    ... 2
    Feb 10, 2018
    42
    3,109
    Replies: 42
    8
  9. Afina

    B Scattering of light in a strange fashion

    Feb 9, 2018
    2
    415
    Replies: 2
    2
  10. nmsurobert

    I Protostar detection

    Feb 6, 2018
    6
    536
    Replies: 6
    2
  11. William LL

    B Light spectrum of planet Earth as seen from space

    Feb 5, 2018
    3
    407
    Replies: 3
    0
  12. jim mcnamara

    I Extragalactic planets

    Feb 5, 2018
    3
    423
    Replies: 3
    2
  13. wolram

    B If Quark stars exist why do Neutron stars become Black holes?

    Feb 5, 2018
    11
    1,020
    Replies: 11
    5
  14. madsmh

    I Orbit simulations, tidal forces and planetary oblateness

    Feb 4, 2018
    10
    598
    Replies: 10
    0
  15. astrogato96

    I Upper Level Planetary Journal

    Feb 3, 2018
    5
    433
    Replies: 5
    1
  16. BL4CKB0X97

    B Is blue shift as common as red shift?

    ... 2
    Feb 3, 2018
    26
    2,162
    Replies: 26
    9
  17. zdcyclops

    B If the moon were a light bulb how many watts would it be.

    Feb 2, 2018
    13
    1,117
    Replies: 13
    8
  18. jordankonisky

    B The Moon's inclination to Earth's equator

    Feb 2, 2018
    3
    462
    Replies: 3
    0
  19. Charles Link

    B Tonight's full moon and lunar eclipse

    Feb 1, 2018
    11
    545
    Replies: 11
    5
  20. Carpe Physicum

    B How Can Astronomy Even Occur? (Oort Cloud)

    ... 2
    Jan 31, 2018
    35
    1,773
    Replies: 35
    23
  21. GTOM

    B Can Star Wars-like asteroid storms exist?

    Jan 31, 2018
    1
    374
    Replies: 1
    0
  22. DiscoProJoe

    B Temperature of a black hole...observed from the singularity

    Jan 30, 2018
    13
    682
    Replies: 13
    0
  23. heavystray

    B Tc and Teff

    Jan 30, 2018
    2
    353
    Replies: 2
    0
  24. bbbl67

    I What is the minimum mass of a neutron star?

    Jan 28, 2018
    23
    1,251
    Replies: 23
    3
  25. Assaltwaffle

    I Star Gravitational Binding Energy Questions

    Jan 27, 2018
    8
    1,103
    Replies: 8
    4
  26. heavystray

    B Choice of pair of filters

    Jan 26, 2018
    5
    313
    Replies: 5
    0
  27. heavystray

    B Temperature based on colour index using Planck's law

    Jan 26, 2018
    4
    392
    Replies: 4
    0
  28. roineust

    B Is the starshade going to be positioned in a fixed location?

    Jan 26, 2018
    7
    553
    Replies: 7
    5
  29. bbbl67

    I Type Ia supernova involving binary white dwarfs?

    Jan 25, 2018
    8
    593
    Replies: 8
    2
  30. David Roberts

    Could Dark Matter be H or He? They are pervasive

    Jan 25, 2018
    11
    930
    Replies: 11
    1
  31. MulderFBI

    B Unusual object on video - any explanation?

    Jan 24, 2018
    3
    585
    Replies: 3
    5
  32. JohnnyGui

    I Some confusion about Kepler’s formula

    Jan 23, 2018
    11
    784
    Replies: 11
    3
  33. jim mcnamara

    B Wonder-inducing ring galaxy image

    Jan 23, 2018
    5
    526
    Replies: 5
    5
  34. ZiHao

    B Additional Maths

    Jan 22, 2018
    2
    378
    Replies: 2
    0
  35. jordankonisky

    I I use an Olll filter to view emission nebula -- how do they work?

    Jan 21, 2018
    1
    309
    Replies: 1
    0
  36. junjunjun233

    I Possibility of a Planck Star

    Jan 17, 2018
    1
    835
    Replies: 1
    0
  37. Rednecknav

    I Moon vs Earth for launch to Mars

    ... 2 3 4
    Jan 17, 2018
    98
    3,341
    Replies: 98
    54
  38. r8chard

    Designating Alien Life

    ... 2
    Jan 16, 2018
    31
    1,697
    Replies: 31
    3
  39. darkmattermonkey

    B Grav-stars vs. Neutron Stars?

    Jan 16, 2018
    4
    506
    Replies: 4
    1
  40. starstruck_

    A Trouble visualizing and understanding the celestial sphere

    Jan 15, 2018
    7
    486
    Replies: 7
    3
  41. nmsurobert

    I Balmer series lines

    Jan 15, 2018
    9
    341
    Replies: 9
    4
  42. 1oldman2

    B Asteroid/Near Earth object mining

    ... 4 5 6
    Jan 15, 2018
    140
    10,491
    Replies: 140
    118
  43. Hawksteinman

    Stargazing Is this a good telescope?

    Jan 13, 2018
    10
    589
    Replies: 10
    12
  44. sophiecentaur
    Featured

    I Were all these exoplanets a surprise?

    Jan 11, 2018
    6
    1,059
    Replies: 6
    4
  45. Suekdccia

    A Could vacuum decay fundamentally change our universe?

    Jan 11, 2018
    5
    805
    Replies: 5
    0
  46. lifeonmercury

    B Oumuamua asteroid discussion

    ... 2
    Jan 11, 2018
    25
    2,032
    Replies: 25
    8
  47. wolram

    B How did Jupiter and Saturn disrupt our solar system

    Jan 11, 2018
    6
    464
    Replies: 6
    0
  48. jefsART

    B Can we identify the centre of the Universe?

    ... 2 3 4
    Jan 10, 2018
    97
    6,928
    Replies: 97
    24
  49. Edward Barrow

    I Can anyone tell me if 2009 MS9 is prograde or retrograde?

    Jan 10, 2018
    3
    318
    Replies: 3
    1
  50. nmsurobert

    I Stars and blackbody radiation

    Jan 10, 2018
    1
    262
    Replies: 1
    1
  51. roineust

    I 'Oumuamua detection date and ramifications for a big asteroid collision with the Earth

    ... 2 3 4
    Jan 10, 2018
    85
    4,468
    Replies: 85
    43
  52. fizzy

    I ‘Tabby’s Star’ a binary?

    Jan 9, 2018
    22
    2,713
    Replies: 22
    1
  53. wolram

    B All about Titan

    Jan 9, 2018
    7
    391
    Replies: 7
    1
  54. Philippos

    Does the event horizon of a black hole really represent the surface of the star/mass?

    Jan 9, 2018
    15
    913
    Replies: 15
    5
  55. Suyash Singh

    Width of milky way

    Jan 8, 2018
    1
    381
    Replies: 1
    2
  56. mfb
    Featured

    I Update on liquid water on Mars - maybe it is sand?

    Jan 8, 2018
    12
    1,631
    Replies: 12
    5
  57. nearc

    B History of RA [why is the vernal equinox used?]

    Jan 6, 2018
    5
    591
    Replies: 5
    4
  58. OmCheeto

    B The League of Extraordinarily BIG Telescopes

    Jan 5, 2018
    8
    572
    Replies: 8
    5
  59. Ozfer

    B Is a black hole waterproof?

    Jan 4, 2018
    2
    439
    Replies: 2
    1
  60. nnkl

    I Exploring Einstein's theory about the curvature of space

    Jan 4, 2018
    2
    535
    Replies: 2
    1
  61. Curtnos

    I Calculating signal to noise ratio for deimos data

    Jan 2, 2018
    3
    461
    Replies: 3
    0
  62. cptolemy

    I JPL ephemeris files

    Jan 1, 2018
    1
    421
    Replies: 1
    0
  63. davenn

    Stargazing The moon

    Dec 31, 2017
    5
    368
    Replies: 5
    14
  64. Rednecknav

    I Space Trash

    Dec 31, 2017
    15
    948
    Replies: 15
    6
  65. Arman777

    I Redshift and Scale factor

    Dec 31, 2017
    8
    408
    Replies: 8
    4
  66. Sanborn Chase

    I What's the effect of solar pole reversal on the Parker Spiral?

    Dec 30, 2017
    3
    542
    Replies: 3
    0
  67. mr1batman

    B Distance between the Earth and The Moon

    Dec 30, 2017
    10
    945
    Replies: 10
    3
  68. Jason R Carrico

    B Neutron stars and black holes

    ... 2 3
    Dec 29, 2017
    70
    5,792
    Replies: 70
    21
  69. nmsurobert

    I Star spectra and star color relation

    Dec 28, 2017
    3
    338
    Replies: 3
    0
  70. Snooch

    B What's the deal with dark matter

    ... 2
    Dec 28, 2017
    45
    3,414
    Replies: 45
    8
  71. wolram

    B Chaos of the solar system

    Dec 28, 2017
    6
    484
    Replies: 6
    1
  72. mfb
    Featured

    I New Kepler results (8th planet around Kepler-90)

    ... 2
    Dec 27, 2017
    29
    3,142
    Replies: 29
    31
  73. tzimie

    I Low mass limit of a neutron star

    ... 2
    Dec 26, 2017
    26
    1,392
    Replies: 26
    5
  74. mfb

    I NASA finalists for New Frontiers: Rosetta's comet or Titan

    Dec 26, 2017
    1
    357
    Replies: 1
    4
  75. Spinnor

    B New theory, our solar system formation, "space bubble".

    Dec 26, 2017
    9
    664
    Replies: 9
    5
  76. David Berger

    I Programable telescope that will point to any spot on Earth?

    Dec 24, 2017
    11
    535
    Replies: 11
    4
  77. Gerinski

    I Are there galaxies with 2 cores?

    Dec 22, 2017
    9
    944
    Replies: 9
    3
  78. sophiecentaur

    Stargazing Is it nebulosity or an artefact?

    ... 2
    Dec 18, 2017
    28
    1,106
    Replies: 28
    6
  79. Karagoz

    B How do astronomers find the "parallax angle" of a star?

    ... 2
    Dec 17, 2017
    25
    1,405
    Replies: 25
    8
  80. davenn

    Stargazing For those aurora chasers -- a heads up

    ... 2 3
    Dec 16, 2017
    52
    3,603
    Replies: 52
    36
  81. Philosophaie

    Vernal Equinox

    Dec 15, 2017
    1
    2,521
    Replies: 1
    0
  82. le chat

    I Transit Photometry

    Dec 14, 2017
    5
    403
    Replies: 5
    4
  83. Will K

    B Black Holes and Information

    ... 2
    Dec 14, 2017
    27
    2,508
    Replies: 27
    7
  84. aurora7790

    I Quasar Number Densities and Lifetimes

    Dec 12, 2017
    1
    271
    Replies: 1
    0
  85. vin300

    I Magnetosphere on mars

    Dec 12, 2017
    8
    455
    Replies: 8
    3
  86. bruha

    B Optical eyepieces for star observations

    Dec 11, 2017
    16
    840
    Replies: 16
    2
  87. Rubidium_71

    I Mars Ice Core Samples

    Dec 11, 2017
    5
    1,274
    Replies: 5
    4
  88. Leonardo Machado

    I Why is neutron star interesting to physics ?

    Dec 11, 2017
    8
    596
    Replies: 8
    5
  89. Dalton Peters

    I What happens if two black holes collide

    Dec 11, 2017
    12
    1,267
    Replies: 12
    4
  90. SWB123

    I Why is the time of formation of this Black Hole in question?

    Dec 10, 2017
    15
    748
    Replies: 15
    1
  91. mfb

    I Fly-by anomaly is back with Juno

    Dec 10, 2017
    1
    359
    Replies: 1
    0
  92. Borg
    Featured

    Stargazing U.S. Solar Eclipse of Aug. 21, 2017

    ... 15 16 17
    Dec 9, 2017
    413
    29,586
    Replies: 413
    503
  93. MrQuack

    B Are there any SPH planet collision simulators?

    Dec 9, 2017
    19
    1,017
    Replies: 19
    0
  94. |Glitch|

    I Action Dynamics of the Local Supercluster

    Dec 9, 2017
    7
    331
    Replies: 7
    2
  95. wolram

    B How did this Black Hole come to exist?

    Dec 8, 2017
    5
    469
    Replies: 5
    0
  96. Tom Mcfarland

    I Hubble red shifts could be gravitational red shifts rather than space-expansion red shifts?

    Dec 8, 2017
    24
    1,286
    Replies: 24
    6
  97. nomadreid

    I Holographic principle versus no-cloning

    Dec 8, 2017
    2
    368
    Replies: 2
    1
  98. websterling
    Featured

    I GW170608 - Another Binary Black Hole Merger Observed

    Dec 7, 2017
    24
    2,496
    Replies: 24
    8
  99. wolram

    B Life is less likely on exoplanets

    Dec 7, 2017
    19
    1,045
    Replies: 19
    14
  100. Harshu Pande

    B Debate about how a light year can be used

    Dec 7, 2017
    10
    680
    Replies: 10
    10
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