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  1. 1oldman2
    Featured

    B Space Stuff and Launch Info

    ... 24 25 26
    Sep 17, 2018
    515
    29,677
    Replies: 515
    400
  1. wywong

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

    Sep 23, 2018 at 1:06 PM
    15
    852
    Replies: 15
    7
  2. BeedS

    B The Sun's magnetic field

    Sep 21, 2018 at 1:49 PM
    15
    930
    Replies: 15
    2
  3. nmsurobert

    B Uranus and/or Neptune Lab ideas

    Sep 18, 2018 at 12:48 AM
    11
    455
    Replies: 11
    1
  4. Spinnor

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

    Sep 15, 2018
    1
    562
    Replies: 1
    0
  5. benorin

    B The geometry of the expansion of space

    Sep 15, 2018
    5
    501
    Replies: 5
    3
  6. nmsurobert

    B High school Astro Club

    Sep 14, 2018
    2
    206
    Replies: 2
    4
  7. DonutLord

    B Is right ascension only measured once a year?

    Sep 12, 2018
    6
    462
    Replies: 6
    4
  8. kolleamm

    B The accelerating expansion of the universe

    Sep 4, 2018
    3
    511
    Replies: 3
    3
  9. happyhacker

    B An observer looking at Earth's past history

    Aug 29, 2018
    3
    294
    Replies: 3
    1
  10. tovisonnenberg

    B Brown Dwarfs

    Aug 27, 2018
    5
    328
    Replies: 5
    1
  11. shimun

    B Solar System Moving Speed

    ... 2 3
    Aug 26, 2018
    55
    2,570
    Replies: 55
    25
  12. Edeff

    B Are they still there?

    Aug 24, 2018
    6
    590
    Replies: 6
    7
  13. AGuglielmone

    B Are all wavelengths of light possible?

    Aug 21, 2018
    8
    655
    Replies: 8
    0
  14. nivamani Rajbongshi

    B Space: Color and Resources

    Aug 18, 2018
    5
    264
    Replies: 5
    3
  15. tovisonnenberg

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

    Aug 13, 2018
    8
    674
    Replies: 8
    1
  16. tovisonnenberg

    B Why will Betelgeuse go supernova?

    Aug 13, 2018
    9
    853
    Replies: 9
    2
  17. Delta²

    B Water colour in Mars

    Aug 10, 2018
    7
    536
    Replies: 7
    5
  18. nikkkom

    B Planet Nine race, how is it going?

    Aug 8, 2018
    10
    1,082
    Replies: 10
    4
  19. CygnusX-1

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

    Aug 7, 2018
    1
    239
    Replies: 1
    1
  20. Mikaelochi

    B A Question Concerning Lunar Eclipses and Aristarchus's Work

    Aug 4, 2018
    3
    201
    Replies: 3
    1
  21. tovisonnenberg

    B Neutron star collisions

    Aug 1, 2018
    3
    359
    Replies: 3
    0
  22. gmax137

    B Saturn's Rings Appearance from Saturn?

    Jul 28, 2018
    6
    416
    Replies: 6
    7
  23. jedishrfu

    B Attention: We have an important announcement from our Sun

    Jul 27, 2018
    4
    424
    Replies: 4
    4
  24. Sai Siddhartha k

    B General theory of relativity&Planet orbits

    Jul 27, 2018
    5
    325
    Replies: 5
    4
  25. Simon Peach

    B Dark Matter

    ... 2 3
    Jul 23, 2018
    56
    2,273
    Replies: 56
    2
  26. diogenesNY

    B NYTimes: 79 Moons of Jupiter and Counting

    Jul 20, 2018
    1
    278
    Replies: 1
    2
  27. jedishrfu

    B Blazar as the Source of Cosmic Neutrinos Confirmed

    Jul 17, 2018
    8
    584
    Replies: 8
    4
  28. SlowThinker

    B Known properties and constraints of dark matter

    Jul 15, 2018
    11
    701
    Replies: 11
    4
  29. CygnusX-1
    Featured

    B First Interstellar Asteroid Found

    ... 5 6 7
    Jul 15, 2018
    124
    7,533
    Replies: 124
    37
  30. K. Doc Holiday

    B The Stefan-Boltzmann Law and Sunspots

    Jul 13, 2018
    2
    268
    Replies: 2
    1
  31. MeAndMyLucidLife

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

    Jul 3, 2018
    10
    763
    Replies: 10
    5
  32. jk22

    B Equivalent gravitational forces in other galaxies

    Jun 29, 2018
    3
    410
    Replies: 3
    0
  33. TeethWhitener

    B Oumuamua non-gravitational acceleration

    Jun 28, 2018
    1
    553
    Replies: 1
    3
  34. empleat

    B Please explain to me the 2d holographic universe

    Jun 27, 2018
    3
    479
    Replies: 3
    2
  35. Suekdccia

    B What is a non-real observer?

    Jun 26, 2018
    1
    285
    Replies: 1
    0
  36. Grinkle

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

    Jun 21, 2018
    18
    722
    Replies: 18
    4
  37. hyunxu

    B The Sun is cool or hot?

    ... 2 3
    Jun 20, 2018
    44
    2,849
    Replies: 44
    21
  38. All year camper

    B Explain my sightings

    Jun 19, 2018
    3
    738
    Replies: 3
    2
  39. Sanborn Chase

    B Speed of Light in Dark Matter

    ... 2
    Jun 17, 2018
    29
    1,880
    Replies: 29
    14
  40. Baluncore

    B SOFIA IR Observatory in the Southern Sky.

    Jun 14, 2018
    4
    358
    Replies: 4
    1
  41. john1800

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

    Jun 13, 2018
    11
    681
    Replies: 11
    3
  42. Phys12

    B How is noise removed in radio telescopes?

    ... 2
    Jun 12, 2018
    28
    1,037
    Replies: 28
    11
  43. Erribert

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

    Jun 10, 2018
    7
    451
    Replies: 7
    6
  44. Chronos

    B The thirty meter telescope

    Jun 9, 2018
    2
    503
    Replies: 2
    7
  45. wolram

    B How is LIGO doing?

    May 31, 2018
    6
    945
    Replies: 6
    1
  46. hyunxu

    B Calculating Weight and mass of entire black hole

    May 30, 2018
    11
    1,525
    Replies: 11
    7
  47. Sophrosyne

    B Spectroscopy of stars

    May 29, 2018
    4
    417
    Replies: 4
    0
  48. Ashraf Siddiqui

    B Solar Eclipse by a Black Hole

    ... 2
    May 25, 2018
    34
    2,399
    Replies: 34
    12
  49. Thecla

    B Milky Way Galaxy in 1900

    May 15, 2018
    8
    727
    Replies: 8
    6
  50. Android17

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

    May 9, 2018
    13
    1,275
    Replies: 13
    5
  51. A Alex P

    B Measurements in astronomy

    May 3, 2018
    5
    473
    Replies: 5
    2
  52. Craftek_Ana

    B Traveling to Mars and time dilation

    May 3, 2018
    4
    850
    Replies: 4
    1
  53. ANAMUL

    B Midnight Sun in the Arctic

    Apr 30, 2018
    5
    890
    Replies: 5
    1
  54. Simon Peach

    B Are circular orbits normal

    ... 2
    Apr 26, 2018
    22
    982
    Replies: 22
    6
  55. DudeWut

    B External energy source?

    Apr 26, 2018
    8
    449
    Replies: 8
    0
  56. BL4CKB0X97

    B Number of stars in the universe over time

    Apr 25, 2018
    2
    270
    Replies: 2
    2
  57. Treva31

    B Orbit circularisation/insertion spreadsheet

    Apr 20, 2018
    15
    407
    Replies: 15
    10
  58. DaveC426913

    B Asteroid Belt not so circular?

    Apr 20, 2018
    2
    361
    Replies: 2
    1
  59. simon willetts

    B What path does the Earth take

    Apr 18, 2018
    12
    1,268
    Replies: 12
    7
  60. Lukeblackhill

    B "The Galaxy" vs Milky Way

    ... 2
    Apr 15, 2018
    25
    1,393
    Replies: 25
    24
  61. Laurie K

    B Basic rule for Atmospheric Reentry of Glider Class vehicles

    Apr 15, 2018
    12
    953
    Replies: 12
    5
  62. Ranku

    B Density of matter at a galactic center

    Apr 15, 2018
    6
    605
    Replies: 6
    0
  63. sophiecentaur

    B Using Venus in the Parker Solar Probe mission

    Apr 13, 2018
    5
    526
    Replies: 5
    1
  64. sophiecentaur

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

    Apr 7, 2018
    13
    784
    Replies: 13
    2
  65. Greg Bernhardt

    B HiRISE images show strange-looking Mars formations

    Apr 6, 2018
    2
    383
    Replies: 2
    2
  66. Physics345

    B Moon: Apollo 15 Flag Waving

    ... 2
    Apr 2, 2018
    31
    1,515
    Replies: 31
    21
  67. wolram

    B Chinese not sure where space station will land

    ... 2 3
    Apr 2, 2018
    46
    2,982
    Replies: 46
    22
  68. GTOM

    B Survival on Mars?

    ... 13 14 15
    Apr 1, 2018
    297
    24,835
    Replies: 297
    56
  69. cosmo777

    B Interplanetary travel, Arctic sea ice

    ... 3 4 5
    Mar 28, 2018
    85
    2,916
    Replies: 85
    29
  70. quasarLie

    B Sloan digital sky survey

    Mar 27, 2018
    13
    720
    Replies: 13
    4
  71. Ziang

    B Supernova DES16C2nm

    ... 2
    Mar 22, 2018
    24
    1,103
    Replies: 24
    1
  72. jim mcnamara

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

    Mar 21, 2018
    1
    556
    Replies: 1
    0
  73. jedishrfu

    B Physicist who Questioned Black Holes

    Mar 17, 2018
    4
    725
    Replies: 4
    1
  74. fresh_42

    B 3rd cosmic velocity

    Mar 15, 2018
    2
    512
    Replies: 2
    7
  75. swampwiz

    B Does a partial solar eclipse never completely rise?

    Mar 14, 2018
    18
    578
    Replies: 18
    6
  76. unusually_wrong

    B RIP Stephen Hawking =(

    Mar 14, 2018
    1
    345
    Replies: 1
    0
  77. Space_Girl

    B Life Outside Our Planet Without Oxygen and Water

    ... 2
    Mar 13, 2018
    30
    1,518
    Replies: 30
    12
  78. Buckethead

    B Spiral galaxies: Multiple axies of rotation?

    Mar 6, 2018
    17
    690
    Replies: 17
    7
  79. ISamson

    B Massive Space Objects Have Connections to QM Math

    Mar 6, 2018
    1
    421
    Replies: 1
    1
  80. swampwiz

    B Are the profiles for reflecting/refracting spherical?

    Mar 5, 2018
    4
    367
    Replies: 4
    1
  81. bluecap

    B Dark matter variations on Earth

    ... 3 4 5
    Mar 1, 2018
    96
    5,007
    Replies: 96
    29
  82. dennis_n

    B How large would the sun be if it were frozen?

    Feb 28, 2018
    12
    693
    Replies: 12
    9
  83. Stephenk53

    B Star's first stages

    Feb 26, 2018
    2
    366
    Replies: 2
    1
  84. Mlesnita Daniel

    B What do I need to become an Astrophysicist?

    Feb 25, 2018
    2
    526
    Replies: 2
    2
  85. quasarLie

    B Quasar SED

    Feb 21, 2018
    5
    320
    Replies: 5
    1
  86. VetStudent

    B Conflicting thought on quasars and black holes

    Feb 19, 2018
    6
    869
    Replies: 6
    3
  87. wolram

    B Maximum weight of a Neutron star

    Feb 18, 2018
    5
    829
    Replies: 5
    1
  88. Martin Peasha

    B Could we launch spaceships from a long horizontal ramp?

    Feb 11, 2018
    2
    494
    Replies: 2
    1
  89. Go Nucelar

    B Adding a huge electric charge to a black hole?

    ... 2 3
    Feb 10, 2018
    42
    3,248
    Replies: 42
    8
  90. Afina

    B Scattering of light in a strange fashion

    Feb 9, 2018
    2
    455
    Replies: 2
    2
  91. William LL

    B Light spectrum of planet Earth as seen from space

    Feb 5, 2018
    3
    456
    Replies: 3
    0
  92. wolram

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

    Feb 5, 2018
    11
    1,072
    Replies: 11
    5
  93. BL4CKB0X97

    B Is blue shift as common as red shift?

    ... 2
    Feb 3, 2018
    26
    2,395
    Replies: 26
    9
  94. zdcyclops

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

    Feb 2, 2018
    13
    1,273
    Replies: 13
    8
  95. jordankonisky

    B The Moon's inclination to Earth's equator

    Feb 2, 2018
    3
    500
    Replies: 3
    0
  96. Charles Link

    B Tonight's full moon and lunar eclipse

    Feb 1, 2018
    11
    635
    Replies: 11
    5
  97. Carpe Physicum

    B How Can Astronomy Even Occur? (Oort Cloud)

    ... 2
    Jan 31, 2018
    35
    1,876
    Replies: 35
    23
  98. GTOM

    B Can Star Wars-like asteroid storms exist?

    Jan 31, 2018
    1
    399
    Replies: 1
    0
  99. DiscoProJoe

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

    Jan 30, 2018
    13
    737
    Replies: 13
    0
  100. heavystray

    B Tc and Teff

    Jan 30, 2018
    2
    401
    Replies: 2
    0
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