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Galactic News

(74 posts)

  1. Steve R.
    Member

    Since there is a Solar System News thread, it only seems proper to have one concerning galactic news.

    This article from the Washington Post, "This unusually bright ancient galaxy may show signs of the first generation of stars", contains many links to other astronomical articles concerning the source of Earth's water and the possibility of detecting alien life.

    Posted 3 years ago #
  2. geoffhart1962
    Member

    Apparently even quasars have an awkward adolescence:
    http://www.nasa.gov/feature/goddard/nasa-s-hubble-sees-the-teenage-years-of-quasars

    Posted 3 years ago #
  3. geoffhart1962
    Member

    RIP "event horizon"?
    https://www.quantamagazine.org/20150623-fuzzballs-black-hole-firewalls/

    Seems like the event horizon, per se, is alive and well, just more fuzzy than what we've conventionally seen as "discrete".

    Posted 2 years ago #
  4. Greg
    Member

    I have apparently just slipped over some sort of event horizon in Odd Items myself. Posts that I make in that thread are now visible only when I am logged in. I may have brought a curse upon myself by speaking of that very problem.

    Posted 2 years ago #
  5. Steve R.
    Member

    Greg, it appears that some-sort of alien intergalactic secret evil organization is interfering with some threads on this forum. The post that I have made on Solar System news vaporize into oblivion never to be seen.

    Geoff: Very interesting article.

    Posted 2 years ago #
  6. Marian
    Member

  7. geoffhart1962
    Member

    Beautiful image of planetary nebula:
    http://gizmodo.com/born-again-planetary-nebula-keeps-reacting-after-it-die-1720528940

    Posted 2 years ago #
  8. geoffhart1962
    Member

    Amazing images of the Milky Way over Yellowstone:
    http://space.io9.com/the-milky-way-over-yellowstone-is-impossibly-beautiful-1719201635

    Posted 2 years ago #
  9. geoffhart1962
    Member

    Beautiful image of the Lagoon Nebula:
    http://skycenter.arizona.edu/gallery/Nebulae/M8_32in

    Posted 2 years ago #
  10. geoffhart1962
    Member

    Yet another gorgeous planetary nebula:
    http://gizmodo.com/look-at-this-gorgeous-ghost-of-a-dying-star-1722190544

    Posted 2 years ago #
  11. geoffhart1962
    Member

    Dancing galaxies:
    http://gizmodo.com/four-galaxies-share-a-destructive-dance-1722950304

    Swing your partner, dos-à-dos!

    Posted 2 years ago #
  12. geoffhart1962
    Member

    Another beautiful nebula, the aptly named "Gem":
    http://gizmodo.com/the-little-gem-nebula-shines-like-a-jewel-1723005825

    Posted 2 years ago #
  13. geoffhart1962
    Member

    Search for Dead Galactic Civilizations:
    http://io9.com/how-we-could-detect-an-alien-apocalypse-from-earth-1723355339

    Well, that's cheery.

    Posted 2 years ago #
  14. geoffhart1962
    Member

    Beautiful image of the crab nebula:
    http://gizmodo.com/the-crab-nebula-is-a-gorgeous-mystery-1724399651

    Posted 2 years ago #
  15. geoffhart1962
    Member

    X-ray image of the center of our galaxy:
    http://www.esa.int/Our_Activities/Space_Science/The_tumultuous_heart_of_our_Galaxy

    Somehow I don't SPF 50 is going to cut it.

    Posted 2 years ago #
  16. JohnWThiel
    Member

    Contemplation of the Crab Nebula seems to be where speculation about black holes originated. The text of this appears also in William Burroughs' NOVA EXPRESS in a shorter form. I wonder if Burroughs was quoting from it.

    Posted 2 years ago #
  17. geoffhart1962
    Member

    The twin-jet nebula:
    http://gizmodo.com/twin-jet-nebula-is-a-marvelous-cosmic-butterfly-1726803636

    Amazing.

    Posted 2 years ago #
  18. geoffhart1962
    Member

    http://apod.nasa.gov/apod/ap150904.html

    Is it just me, or does anyone else see the celestial equivalent of the mid-Atlantic ridge in this image?

    Although... if all galaxies have massive black holes at their core, perhaps this is more like a subduction zone. As above, so below?

    Posted 2 years ago #
  19. geoffhart1962
    Member

  20. geoffhart1962
    Member

    Help astronmers spot black holes:
    http://gizmodo.com/how-to-spot-a-black-hole-1729385629

    Posted 2 years ago #
  21. geoffhart1962
    Member

  22. geoffhart1962
    Member

  23. geoffhart1962
    Member

  24. Marian
    Member

    Great photos you've been posting, Geoff.

    Posted 2 years ago #
  25. geoffhart1962
    Member

    No alien super-civilizations?
    http://io9.com/heres-more-evidence-that-galactic-super-civilizations-d-1732390739

    It's an interesting argument: due to entropy, all energy use results in the generation of "waste heat" = infrared radiation, and the more energy consumed, the more waste heat generated. But it makes a whole bunch of assumptions that may be incorrect, including what seems to be a failure to consider the wide range in efficiencies of energy use for different types of energy. It also wasn't clear to me how well the researchers filtered out the effects of the cosmic microwave background, which would undoubtedly contaminate the primary data to some extent.

    Posted 2 years ago #
  26. geoffhart1962
    Member

  27. Marian
    Member

    Puzzling star (so apparently the internet is buzzing that it's aliens) http://www.slate.com/blogs/bad_astronomy/2015/10/14/weird_star_strange_dips_in_brightness_are_a_bit_baffling.html

    Posted 2 years ago #
  28. Dr. Sardonicus
    Member

    Curious indeed. A major diminution of brightness that is not periodic, and is not accompanied by IR (as would be the case if the star's light were being blocked by dust or gas).

    The last time I remember hearing of alien technology seriously proposed to explain a new and puzzling astronomical phenomenon was periodic pulses of EM coming from deep space. However, the idea of aliens was dropped when scientists realized just how distant the sources were, and thus how powerful the mysterious signals actually were. The objects are now called pulsars.

    It is possible, I suppose (invoking Green's Law of Debate) that the light of KIC 8462852 isn't being blocked at all, but that the star itself is, for lack of a better term, flickering -- flickering madly, like a gassy fluorescent tube. I've heard of "variable stars," but none anywhere near so violently chaotic.

    Posted 2 years ago #
  29. Marian
    Member

    Beginning search for signals from KIC etc (If it's going to be in the news, it needs an easy name!) http://www.space.com/30855-alien-life-search-kepler-megastructure.html

    Posted 2 years ago #
  30. Greg
    Member

    If the fluctuations were caused by objects orbiting the star, wouldn't we expect a repeating pattern to eventually emerge?

    Posted 2 years ago #

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