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  1. 1oldman2
    Featured

    B Space Stuff and Launch Info

    ... 25 26 27
    Nov 5, 2018
    522
    31,871
    Replies: 522
    411
  1. Green dwarf

    B Was the universe is infinitely large at the big bang?

    Nov 16, 2018 at 10:15 AM
    11
    285
    Replies: 11
    1
  2. CygnusX-1

    B Barnard's Star, 6 Light-Years Away, May Have Cold SuperEarth

    Nov 14, 2018 at 6:17 PM
    1
    410
    Replies: 1
    2
  3. nichos

    B Gravity can't be so strong

    Nov 11, 2018 at 8:49 PM
    14
    1,151
    Replies: 14
    6
  4. .Scott

    B Oumuamua remains a puzzle

    Nov 11, 2018 at 5:55 AM
    5
    662
    Replies: 5
    5
  5. Marcus1122

    B When a star exhausted it's nuclear fuel

    ... 2
    Nov 10, 2018 at 11:36 PM
    20
    354
    Replies: 20
    1
  6. Graeme M

    B What does it mean to say that "space" has a temperature?

    Nov 10, 2018 at 4:33 PM
    19
    771
    Replies: 19
    3
  7. Mlesnita Daniel

    B Ideas to protect the Earth from possible asteroid impacts

    Nov 8, 2018
    9
    423
    Replies: 9
    1
  8. nmsurobert

    B Great red spot forward speed

    Nov 4, 2018
    2
    172
    Replies: 2
    2
  9. wolram

    B Picture of the day

    Nov 2, 2018
    2
    185
    Replies: 2
    1
  10. RandomPhysicist

    B Formation of Supermassive Black Holes

    Oct 30, 2018
    3
    323
    Replies: 3
    1
  11. Mlesnita Daniel

    B Why the multiverse makes no sense to me

    Oct 28, 2018
    10
    630
    Replies: 10
    2
  12. fizzy

    B A new "plume" on Mars?

    Oct 28, 2018
    12
    800
    Replies: 12
    2
  13. consuli

    B Rough probability that aliens would visit the Earth?

    ... 2 3
    Oct 27, 2018
    45
    2,823
    Replies: 45
    18
  14. bbbl67

    B Calculating solar irradiance at each planet?

    Oct 27, 2018
    10
    373
    Replies: 10
    4
  15. Aidan345733

    B Fermi Paradox

    Oct 26, 2018
    1
    391
    Replies: 1
    2
  16. unusually_wrong

    B Bose Stars (dark matter in origin)

    Oct 25, 2018
    1
    351
    Replies: 1
    0
  17. Romanko

    B Earth's orbit around the sun -- looking for an equation

    Oct 25, 2018
    6
    417
    Replies: 6
    6
  18. Enniss

    B Can the moon orbit be used as perpetual motion?

    Oct 24, 2018
    5
    360
    Replies: 5
    8
  19. wolram

    B How do planets form?

    Oct 22, 2018
    1
    276
    Replies: 1
    1
  20. Elbraido

    B Modified Newtonian dynamics

    Oct 13, 2018
    3
    406
    Replies: 3
    0
  21. lavinia

    B How much of a star undergoes fusion?

    ... 2
    Oct 9, 2018
    24
    1,488
    Replies: 24
    6
  22. BeedS

    B The Sun's magnetic field

    ... 2
    Oct 1, 2018
    23
    1,421
    Replies: 23
    3
  23. Simon Peach

    B Gravity and neutron stars

    Sep 28, 2018
    6
    571
    Replies: 6
    3
  24. jha192001

    B Black Holes -- What methods to use to find them?

    Sep 28, 2018
    8
    297
    Replies: 8
    4
  25. Brian Muller

    B My telescope's field of view is tiny (about a quarter inch through the focuser w/ 25 mm eyepiece)

    Sep 26, 2018
    7
    416
    Replies: 7
    3
  26. wywong

    B Why don't man-made satellites drift away from the Earth?

    Sep 25, 2018
    17
    1,262
    Replies: 17
    7
  27. nmsurobert

    B Uranus and/or Neptune Lab ideas

    Sep 18, 2018
    11
    576
    Replies: 11
    1
  28. Spinnor

    B Galactic Collision Creates a Ring of Black Holes and Neutron Stars...

    Sep 15, 2018
    1
    676
    Replies: 1
    0
  29. benorin

    B The geometry of the expansion of space

    Sep 15, 2018
    5
    640
    Replies: 5
    4
  30. nmsurobert

    B High school Astro Club

    Sep 14, 2018
    2
    313
    Replies: 2
    4
  31. DonutLord

    B Is right ascension only measured once a year?

    Sep 12, 2018
    6
    569
    Replies: 6
    4
  32. kolleamm

    B The accelerating expansion of the universe

    Sep 4, 2018
    3
    616
    Replies: 3
    3
  33. happyhacker

    B An observer looking at Earth's past history

    Aug 29, 2018
    3
    396
    Replies: 3
    1
  34. tovisonnenberg

    B Brown Dwarfs

    Aug 27, 2018
    5
    401
    Replies: 5
    1
  35. shimun

    B Solar System Moving Speed

    ... 2 3
    Aug 26, 2018
    55
    2,798
    Replies: 55
    25
  36. Edeff

    B Are they still there?

    Aug 24, 2018
    6
    687
    Replies: 6
    7
  37. AGuglielmone

    B Are all wavelengths of light possible?

    Aug 21, 2018
    8
    767
    Replies: 8
    0
  38. nivamani Rajbongshi

    B Space: Color and Resources

    Aug 18, 2018
    5
    334
    Replies: 5
    3
  39. tovisonnenberg

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

    Aug 13, 2018
    8
    751
    Replies: 8
    1
  40. tovisonnenberg

    B Why will Betelgeuse go supernova?

    Aug 13, 2018
    9
    1,037
    Replies: 9
    2
  41. Delta²

    B Water colour in Mars

    Aug 10, 2018
    7
    630
    Replies: 7
    5
  42. nikkkom

    B Planet Nine race, how is it going?

    Aug 8, 2018
    10
    1,249
    Replies: 10
    4
  43. CygnusX-1

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

    Aug 7, 2018
    1
    321
    Replies: 1
    1
  44. Mikaelochi

    B A Question Concerning Lunar Eclipses and Aristarchus's Work

    Aug 4, 2018
    3
    251
    Replies: 3
    1
  45. tovisonnenberg

    B Neutron star collisions

    Aug 1, 2018
    3
    456
    Replies: 3
    0
  46. gmax137

    B Saturn's Rings Appearance from Saturn?

    Jul 28, 2018
    6
    477
    Replies: 6
    7
  47. jedishrfu

    B Attention: We have an important announcement from our Sun

    Jul 27, 2018
    4
    467
    Replies: 4
    4
  48. Sai Siddhartha k

    B General theory of relativity&Planet orbits

    Jul 27, 2018
    5
    396
    Replies: 5
    4
  49. Simon Peach

    B Dark Matter

    ... 2 3
    Jul 23, 2018
    56
    2,468
    Replies: 56
    2
  50. diogenesNY

    B NYTimes: 79 Moons of Jupiter and Counting

    Jul 20, 2018
    1
    303
    Replies: 1
    2
  51. jedishrfu

    B Blazar as the Source of Cosmic Neutrinos Confirmed

    Jul 17, 2018
    8
    626
    Replies: 8
    4
  52. SlowThinker

    B Known properties and constraints of dark matter

    Jul 15, 2018
    11
    812
    Replies: 11
    4
  53. CygnusX-1
    Featured

    B First Interstellar Asteroid Found

    ... 5 6 7
    Jul 15, 2018
    124
    7,871
    Replies: 124
    37
  54. K. Doc Holiday

    B The Stefan-Boltzmann Law and Sunspots

    Jul 13, 2018
    2
    323
    Replies: 2
    1
  55. MeAndMyLucidLife

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

    Jul 3, 2018
    10
    800
    Replies: 10
    5
  56. jk22

    B Equivalent gravitational forces in other galaxies

    Jun 29, 2018
    3
    428
    Replies: 3
    0
  57. TeethWhitener

    B Oumuamua non-gravitational acceleration

    Jun 28, 2018
    1
    597
    Replies: 1
    3
  58. empleat

    B Please explain to me the 2d holographic universe

    Jun 27, 2018
    3
    504
    Replies: 3
    2
  59. Suekdccia

    B What is a non-real observer?

    Jun 26, 2018
    1
    303
    Replies: 1
    0
  60. Grinkle

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

    Jun 21, 2018
    18
    755
    Replies: 18
    4
  61. hyunxu

    B The Sun is cool or hot?

    ... 2 3
    Jun 20, 2018
    44
    3,766
    Replies: 44
    21
  62. All year camper

    B Explain my sightings

    Jun 19, 2018
    3
    757
    Replies: 3
    2
  63. Sanborn Chase

    B Speed of Light in Dark Matter

    ... 2
    Jun 17, 2018
    29
    2,085
    Replies: 29
    14
  64. Baluncore

    B SOFIA IR Observatory in the Southern Sky.

    Jun 14, 2018
    4
    382
    Replies: 4
    1
  65. john1800

    B What is the speed of the Earth traveling through the cosmos?

    Jun 13, 2018
    11
    713
    Replies: 11
    3
  66. Phys12

    B How is noise removed in radio telescopes?

    ... 2
    Jun 12, 2018
    28
    1,338
    Replies: 28
    11
  67. Erribert

    B Would planets fall out of orbit when gravity has a speed?

    Jun 10, 2018
    7
    472
    Replies: 7
    6
  68. Chronos

    B The thirty meter telescope

    Jun 9, 2018
    2
    556
    Replies: 2
    7
  69. wolram

    B How is LIGO doing?

    May 31, 2018
    6
    1,543
    Replies: 6
    1
  70. hyunxu

    B Calculating Weight and mass of entire black hole

    May 30, 2018
    11
    2,163
    Replies: 11
    7
  71. Sophrosyne

    B Spectroscopy of stars

    May 29, 2018
    4
    1,286
    Replies: 4
    0
  72. Ashraf Siddiqui

    B Solar Eclipse by a Black Hole

    ... 2
    May 25, 2018
    34
    2,949
    Replies: 34
    12
  73. Thecla

    B Milky Way Galaxy in 1900

    May 15, 2018
    8
    864
    Replies: 8
    6
  74. Android17

    B Is the solar system formed from the leftovers of a supermassive star that exploded?

    May 9, 2018
    13
    1,444
    Replies: 13
    5
  75. A Alex P

    B Measurements in astronomy

    May 3, 2018
    5
    499
    Replies: 5
    2
  76. Craftek_Ana

    B Traveling to Mars and time dilation

    May 3, 2018
    4
    916
    Replies: 4
    1
  77. ANAMUL

    B Midnight Sun in the Arctic

    Apr 30, 2018
    5
    928
    Replies: 5
    1
  78. Simon Peach

    B Are circular orbits normal

    ... 2
    Apr 26, 2018
    22
    1,038
    Replies: 22
    6
  79. DudeWut

    B External energy source?

    Apr 26, 2018
    8
    486
    Replies: 8
    0
  80. BL4CKB0X97

    B Number of stars in the universe over time

    Apr 25, 2018
    2
    288
    Replies: 2
    2
  81. Treva31

    B Orbit circularisation/insertion spreadsheet

    Apr 20, 2018
    15
    450
    Replies: 15
    10
  82. DaveC426913

    B Asteroid Belt not so circular?

    Apr 20, 2018
    2
    389
    Replies: 2
    1
  83. simon willetts

    B What path does the Earth take

    Apr 18, 2018
    12
    1,294
    Replies: 12
    7
  84. Lukeblackhill

    B "The Galaxy" vs Milky Way

    ... 2
    Apr 15, 2018
    25
    1,506
    Replies: 25
    24
  85. Laurie K

    B Basic rule for Atmospheric Reentry of Glider Class vehicles

    Apr 15, 2018
    12
    1,061
    Replies: 12
    5
  86. Ranku

    B Density of matter at a galactic center

    Apr 15, 2018
    6
    657
    Replies: 6
    0
  87. sophiecentaur

    B Using Venus in the Parker Solar Probe mission

    Apr 13, 2018
    5
    612
    Replies: 5
    1
  88. sophiecentaur

    B North and South poles of Mars are at different temperatures?

    Apr 7, 2018
    13
    818
    Replies: 13
    2
  89. Greg Bernhardt

    B HiRISE images show strange-looking Mars formations

    Apr 6, 2018
    2
    403
    Replies: 2
    2
  90. Physics345

    B Moon: Apollo 15 Flag Waving

    ... 2
    Apr 2, 2018
    31
    1,678
    Replies: 31
    21
  91. wolram

    B Chinese not sure where space station will land

    ... 2 3
    Apr 2, 2018
    46
    3,061
    Replies: 46
    22
  92. GTOM

    B Survival on Mars?

    ... 13 14 15
    Apr 1, 2018
    297
    25,116
    Replies: 297
    56
  93. cosmo777

    B Interplanetary travel, Arctic sea ice

    ... 3 4 5
    Mar 28, 2018
    85
    3,043
    Replies: 85
    29
  94. quasarLie

    B Sloan digital sky survey

    Mar 27, 2018
    13
    753
    Replies: 13
    4
  95. Ziang

    B Supernova DES16C2nm

    ... 2
    Mar 22, 2018
    24
    1,140
    Replies: 24
    1
  96. jim mcnamara

    B Sholz's star entered the Oort cloud ~70kya

    Mar 21, 2018
    1
    573
    Replies: 1
    0
  97. jedishrfu

    B Physicist who Questioned Black Holes

    Mar 17, 2018
    4
    775
    Replies: 4
    1
  98. fresh_42

    B 3rd cosmic velocity

    Mar 15, 2018
    2
    550
    Replies: 2
    7
  99. swampwiz

    B Does a partial solar eclipse never completely rise?

    Mar 14, 2018
    18
    604
    Replies: 18
    6
  100. unusually_wrong

    B RIP Stephen Hawking =(

    Mar 14, 2018
    1
    366
    Replies: 1
    0
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