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  1. 1oldman2
    Featured

    B Space Stuff and Launch Info

    ... 23 24 25
    May 17, 2018 at 8:50 AM
    498
    25,982
    Replies: 498
    390
  1. Phys12

    B How is noise removed in radio telescopes?

    ... 2
    May 22, 2018 at 6:02 PM
    25
    380
    Replies: 25
    10
  2. Johnnyallen

    B Earth's twin planet

    May 22, 2018 at 12:27 PM
    17
    719
    Replies: 17
    5
  3. hyunxu

    B The Sun is cool or hot?

    ... 2
    May 21, 2018 at 3:11 AM
    23
    976
    Replies: 23
    5
  4. Thecla

    B Milky Way Galaxy in 1900

    May 15, 2018
    8
    490
    Replies: 8
    6
  5. Ashraf Siddiqui

    B Solar Eclipse by a Black Hole

    ... 2
    May 10, 2018
    26
    1,154
    Replies: 26
    4
  6. Android17

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

    May 9, 2018
    13
    779
    Replies: 13
    5
  7. hyunxu

    B Calculating Weight and mass of entire black hole

    May 9, 2018
    7
    341
    Replies: 7
    3
  8. All year camper

    B Explain my sightings

    May 7, 2018
    2
    206
    Replies: 2
    1
  9. A Alex P

    B Measurements in astronomy

    May 3, 2018
    5
    327
    Replies: 5
    2
  10. Craftek_Ana

    B Traveling to Mars and time dilation

    May 3, 2018
    4
    558
    Replies: 4
    1
  11. ANAMUL

    B Midnight Sun in the Arctic

    Apr 30, 2018
    5
    730
    Replies: 5
    1
  12. Simon Peach

    B Are circular orbits normal

    ... 2
    Apr 26, 2018
    22
    783
    Replies: 22
    6
  13. DudeWut

    B External energy source?

    Apr 26, 2018
    8
    308
    Replies: 8
    0
  14. BL4CKB0X97

    B Number of stars in the universe over time

    Apr 25, 2018
    2
    189
    Replies: 2
    2
  15. Treva31

    B Orbit circularisation/insertion spreadsheet

    Apr 20, 2018
    15
    293
    Replies: 15
    10
  16. DaveC426913

    B Asteroid Belt not so circular?

    Apr 20, 2018
    2
    246
    Replies: 2
    1
  17. simon willetts

    B What path does the Earth take

    Apr 18, 2018
    12
    1,147
    Replies: 12
    7
  18. Lukeblackhill

    B "The Galaxy" vs Milky Way

    ... 2
    Apr 15, 2018
    25
    1,089
    Replies: 25
    24
  19. Laurie K

    B Basic rule for Atmospheric Reentry of Glider Class vehicles

    Apr 15, 2018
    12
    830
    Replies: 12
    5
  20. Ranku

    B Density of matter at a galactic center

    Apr 15, 2018
    6
    498
    Replies: 6
    0
  21. sophiecentaur

    B Using Venus in the Parker Solar Probe mission

    Apr 13, 2018
    5
    384
    Replies: 5
    1
  22. sophiecentaur

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

    Apr 7, 2018
    13
    650
    Replies: 13
    2
  23. Greg Bernhardt

    B HiRISE images show strange-looking Mars formations

    Apr 6, 2018
    2
    279
    Replies: 2
    2
  24. Physics345

    B Moon: Apollo 15 Flag Waving

    ... 2
    Apr 2, 2018
    31
    1,223
    Replies: 31
    21
  25. wolram

    B Chinese not sure where space station will land

    ... 2 3
    Apr 2, 2018
    46
    2,631
    Replies: 46
    22
  26. GTOM

    B Survival on Mars?

    ... 13 14 15
    Apr 1, 2018
    297
    23,651
    Replies: 297
    56
  27. cosmo777

    B Interplanetary travel, Arctic sea ice

    ... 3 4 5
    Mar 28, 2018
    85
    2,499
    Replies: 85
    29
  28. quasarLie

    B Sloan digital sky survey

    Mar 27, 2018
    13
    636
    Replies: 13
    4
  29. Ziang

    B Supernova DES16C2nm

    ... 2
    Mar 22, 2018
    24
    958
    Replies: 24
    1
  30. jim mcnamara

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

    Mar 21, 2018
    1
    493
    Replies: 1
    0
  31. jedishrfu

    B Physicist who Questioned Black Holes

    Mar 17, 2018
    4
    592
    Replies: 4
    1
  32. fresh_42

    B 3rd cosmic velocity

    Mar 15, 2018
    2
    390
    Replies: 2
    7
  33. swampwiz

    B Does a partial solar eclipse never completely rise?

    Mar 14, 2018
    18
    507
    Replies: 18
    6
  34. unusually_wrong

    B RIP Stephen Hawking =(

    Mar 14, 2018
    1
    290
    Replies: 1
    0
  35. Space_Girl

    B Life Outside Our Planet Without Oxygen and Water

    ... 2
    Mar 13, 2018
    30
    1,300
    Replies: 30
    12
  36. Buckethead

    B Spiral galaxies: Multiple axies of rotation?

    Mar 6, 2018
    17
    578
    Replies: 17
    7
  37. ISamson

    B Massive Space Objects Have Connections to QM Math

    Mar 6, 2018
    1
    323
    Replies: 1
    1
  38. swampwiz

    B Are the profiles for reflecting/refracting spherical?

    Mar 5, 2018
    4
    314
    Replies: 4
    1
  39. bluecap

    B Dark matter variations on Earth

    ... 3 4 5
    Mar 1, 2018
    96
    4,530
    Replies: 96
    29
  40. dennis_n

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

    Feb 28, 2018
    12
    593
    Replies: 12
    9
  41. Stephenk53

    B Star's first stages

    Feb 26, 2018
    2
    310
    Replies: 2
    1
  42. Mlesnita Daniel

    B What do I need to become an Astrophysicist?

    Feb 25, 2018
    2
    428
    Replies: 2
    2
  43. quasarLie

    B Quasar SED

    Feb 21, 2018
    5
    264
    Replies: 5
    1
  44. VetStudent

    B Conflicting thought on quasars and black holes

    Feb 19, 2018
    6
    769
    Replies: 6
    3
  45. wolram

    B Maximum weight of a Neutron star

    Feb 18, 2018
    5
    744
    Replies: 5
    1
  46. Martin Peasha

    B Could we launch spaceships from a long horizontal ramp?

    Feb 11, 2018
    2
    427
    Replies: 2
    1
  47. Go Nucelar

    B Adding a huge electric charge to a black hole?

    ... 2 3
    Feb 10, 2018
    42
    2,970
    Replies: 42
    8
  48. Afina

    B Scattering of light in a strange fashion

    Feb 9, 2018
    2
    382
    Replies: 2
    2
  49. William LL

    B Light spectrum of planet Earth as seen from space

    Feb 5, 2018
    3
    354
    Replies: 3
    0
  50. wolram

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

    Feb 5, 2018
    11
    962
    Replies: 11
    5
  51. BL4CKB0X97

    B Is blue shift as common as red shift?

    ... 2
    Feb 3, 2018
    26
    2,047
    Replies: 26
    9
  52. zdcyclops

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

    Feb 2, 2018
    13
    1,032
    Replies: 13
    8
  53. jordankonisky

    B The Moon's inclination to Earth's equator

    Feb 2, 2018
    3
    428
    Replies: 3
    0
  54. Charles Link

    B Tonight's full moon and lunar eclipse

    Feb 1, 2018
    11
    518
    Replies: 11
    5
  55. Carpe Physicum

    B How Can Astronomy Even Occur? (Oort Cloud)

    ... 2
    Jan 31, 2018
    35
    1,647
    Replies: 35
    23
  56. GTOM

    B Can Star Wars-like asteroid storms exist?

    Jan 31, 2018
    1
    346
    Replies: 1
    0
  57. DiscoProJoe

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

    Jan 30, 2018
    13
    642
    Replies: 13
    0
  58. heavystray

    B Tc and Teff

    Jan 30, 2018
    2
    325
    Replies: 2
    0
  59. heavystray

    B Choice of pair of filters

    Jan 26, 2018
    5
    279
    Replies: 5
    0
  60. heavystray

    B Temperature based on colour index using Planck's law

    Jan 26, 2018
    4
    373
    Replies: 4
    0
  61. roineust

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

    Jan 26, 2018
    7
    525
    Replies: 7
    5
  62. MulderFBI

    B Unusual object on video - any explanation?

    Jan 24, 2018
    3
    559
    Replies: 3
    5
  63. jim mcnamara

    B Wonder-inducing ring galaxy image

    Jan 23, 2018
    5
    481
    Replies: 5
    5
  64. ZiHao

    B Additional Maths

    Jan 22, 2018
    2
    358
    Replies: 2
    0
  65. darkmattermonkey

    B Grav-stars vs. Neutron Stars?

    Jan 16, 2018
    4
    468
    Replies: 4
    1
  66. 1oldman2

    B Asteroid/Near Earth object mining

    ... 6 7 8
    Jan 15, 2018
    140
    10,216
    Replies: 140
    118
  67. lifeonmercury

    B Oumuamua asteroid discussion

    ... 2
    Jan 11, 2018
    25
    1,946
    Replies: 25
    8
  68. wolram

    B How did Jupiter and Saturn disrupt our solar system

    Jan 11, 2018
    6
    433
    Replies: 6
    0
  69. jefsART

    B Can we identify the centre of the Universe?

    ... 3 4 5
    Jan 10, 2018
    97
    6,802
    Replies: 97
    24
  70. wolram

    B All about Titan

    Jan 9, 2018
    7
    361
    Replies: 7
    1
  71. nearc

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

    Jan 6, 2018
    5
    554
    Replies: 5
    4
  72. OmCheeto

    B The League of Extraordinarily BIG Telescopes

    Jan 5, 2018
    8
    528
    Replies: 8
    5
  73. Ozfer

    B Is a black hole waterproof?

    Jan 4, 2018
    2
    386
    Replies: 2
    1
  74. mr1batman

    B Distance between the Earth and The Moon

    Dec 30, 2017
    10
    885
    Replies: 10
    3
  75. Jason R Carrico

    B Neutron stars and black holes

    ... 2 3 4
    Dec 29, 2017
    70
    5,581
    Replies: 70
    21
  76. Snooch

    B What's the deal with dark matter

    ... 2 3
    Dec 28, 2017
    45
    3,320
    Replies: 45
    8
  77. wolram

    B Chaos of the solar system

    Dec 28, 2017
    6
    439
    Replies: 6
    1
  78. Spinnor

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

    Dec 26, 2017
    9
    614
    Replies: 9
    5
  79. Karagoz

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

    ... 2
    Dec 17, 2017
    25
    1,326
    Replies: 25
    8
  80. Will K

    B Black Holes and Information

    ... 2
    Dec 14, 2017
    27
    2,391
    Replies: 27
    7
  81. bruha

    B Optical eyepieces for star observations

    Dec 11, 2017
    16
    782
    Replies: 16
    2
  82. MrQuack

    B Are there any SPH planet collision simulators?

    Dec 9, 2017
    19
    976
    Replies: 19
    0
  83. wolram

    B How did this Black Hole come to exist?

    Dec 8, 2017
    5
    432
    Replies: 5
    0
  84. wolram

    B Life is less likely on exoplanets

    Dec 7, 2017
    19
    988
    Replies: 19
    14
  85. Harshu Pande

    B Debate about how a light year can be used

    Dec 7, 2017
    10
    650
    Replies: 10
    10
  86. bluecap

    B Sirius star system

    Dec 6, 2017
    3
    423
    Replies: 3
    0
  87. CygnusX-1
    Featured

    B First Interstellar Asteroid Found

    ... 4 5 6
    Dec 4, 2017
    109
    5,926
    Replies: 109
    36
  88. tony873004

    B Simulation: Our Solar System's Hyperbolic Residents

    Dec 3, 2017
    3
    449
    Replies: 3
    5
  89. Glenstr

    B Jupiter's gravitational pull on the Sun and Earth

    ... 2
    Dec 3, 2017
    28
    5,126
    Replies: 28
    3
  90. ISamson

    B Chemical study of an old, metal-rich globular cluster

    Nov 30, 2017
    1
    460
    Replies: 1
    0
  91. Gordon Potter IV

    B Dark matter not found in globular clusters orbiting MilkyWay

    Nov 30, 2017
    6
    536
    Replies: 6
    1
  92. Beth Doodle

    B Is there a way of creating placemarks in Stellarium?

    Nov 27, 2017
    7
    424
    Replies: 7
    0
  93. Alfred Cann

    B LIGO paradox

    Nov 17, 2017
    5
    622
    Replies: 5
    2
  94. mfb
    Featured

    B Multiple supernovae from a star

    Nov 17, 2017
    16
    1,937
    Replies: 16
    11
  95. Starkiller

    B Acceleration of a proton/electron toward a neutron star

    Nov 14, 2017
    6
    588
    Replies: 6
    0
  96. Wallsy

    B The bizarre rotation of galaxies

    Nov 14, 2017
    4
    372
    Replies: 4
    1
  97. shihab-kol

    B Expansion of stars

    Nov 14, 2017
    7
    752
    Replies: 7
    3
  98. Beth Doodle

    B Can Jupiter be ignited?

    ... 2 3
    Nov 13, 2017
    40
    1,835
    Replies: 40
    27
  99. wolram

    B Anomalous accelerations in spacecraft flybys of the Earth

    Nov 11, 2017
    6
    904
    Replies: 6
    4
  100. SciencewithDrJ

    B Impact of Kepler Telescope Findings on the Drake Equation

    Nov 9, 2017
    8
    763
    Replies: 8
    7
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