Astronomy, Exobiology, & Cosmology

amateur astronomy, astrophysics, exoscience

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  1. Saint

    The size of this universe

    Saint, Jan 14, 2014 ... 13 14 15
    Replies:
    281
    Views:
    15,088
    Fraggle Rocker
    Feb 3, 2014
  2. geordief

    James Webb Space Telescope

    geordief, Dec 24, 2021 ... 4 5 6
    Replies:
    104
    Views:
    14,745
    Michael 345
    Oct 2, 2022
  3. Saint

    Does cosmology answer why the universe exist?

    Saint, Nov 9, 2020 ... 4 5 6
    Replies:
    112
    Views:
    14,651
    Pinball1970
    Jan 14, 2024
  4. utopian knight

    what is beyond the known universe?

    utopian knight, Oct 6, 2006 ... 7 8 9
    Replies:
    176
    Views:
    14,556
    kaneda
    Apr 24, 2009
  5. Nobody

    What is Spacetime?

    Nobody, Oct 22, 2011 ... 6 7 8
    Replies:
    140
    Views:
    14,502
    Aqueous Id
    Jan 31, 2012
  6. pluto2

    how many stars does a regular galaxy have?

    pluto2, Dec 31, 2008 ... 2 3
    Replies:
    41
    Views:
    14,305
    Cyperium
    Jan 22, 2009
  7. Tristan

    Reflector VS Refractor

    Tristan, Dec 7, 2001 ... 2
    Replies:
    29
    Views:
    14,156
    Xevious
    Jun 9, 2003
  8. ISDAMan

    Black Holes A Opposed To The Big Bang

    ISDAMan, Apr 30, 2015 ... 12 13 14
    Replies:
    278
    Views:
    14,074
    paddoboy
    May 26, 2015
  9. Shadow1

    does the univerce have an end, a limit?

    Shadow1, Jan 1, 2010 ... 6 7 8
    Replies:
    143
    Views:
    14,067
    Fraggle Rocker
    May 27, 2010
  10. Mind Over Matter

    Why the US has not been back to the moon?

    Mind Over Matter, Jan 12, 2012 ... 5 6 7
    Replies:
    133
    Views:
    14,045
    spidergoat
    Jul 2, 2012
  11. lbiarge

    Very low probability of 2 advanced societies at same time in near universe

    lbiarge, Feb 24, 2013 ... 2 3 4
    Replies:
    66
    Views:
    14,004
    rodereve
    Mar 31, 2013
  12. The God

    Cosmological Red Shift

    The God, Apr 3, 2016 ... 12 13 14
    Replies:
    279
    Views:
    13,955
    paddoboy
    Apr 17, 2016
  13. blobrana

    US spy satellite re-entry

    blobrana, Jan 26, 2008 ... 6 7 8
    Replies:
    150
    Views:
    13,902
    Billy T
    Mar 20, 2008
  14. praty

    Universe from Nothing.

    praty, Apr 27, 2011 ... 4 5 6
    Replies:
    103
    Views:
    13,526
    Stryder
    Aug 10, 2011
  15. Xevious
    Locked

    Tasco 46-114375 Review [WOW at $110]

    Xevious, Oct 1, 2003
    Replies:
    4
    Views:
    13,233
    blobrana
    Mar 15, 2005
  16. markl323

    Determinism and the Big Bang

    markl323, Jan 28, 2009 ... 3 4 5
    Replies:
    87
    Views:
    13,080
    Dinosaur
    Oct 7, 2015
  17. Robittybob1

    How Do they Know ours is a Zero Energy Universe?

    Robittybob1, Dec 15, 2011 ... 3 4 5
    Replies:
    80
    Views:
    13,068
    Robittybob1
    Dec 19, 2011
  18. bradguth

    What's the Terminal Velocity of Space

    bradguth, Jul 4, 2004
    Replies:
    15
    Views:
    12,799
    (Q)
    Aug 3, 2004
  19. Popcorn8636

    Can anything surpass the speed of light???

    Popcorn8636, Aug 27, 2002 ... 5 6 7
    Replies:
    121
    Views:
    12,775
    Anomalous
    Feb 2, 2006
  20. Vortexx

    Ethertheory

    Vortexx, Dec 22, 2002 ... 2 3
    Replies:
    47
    Views:
    12,724
    Nico Benschop
    Oct 28, 2003
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