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Thread: Astronomy

  1. #976
    On the road, but not! Danik 2016's Avatar
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    "You can always find something better than death."
    Jacob and Wilhelm Grimm, The Bremen Town Musicians

  2. #977
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    Interesting, but the theory needs testing in practice.

  3. #978
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    The article says that we need "exotic matter" to make the time machine work, but this has not been discovered. So this time machine is probably not a feasible test for our current gravitational theory.

    Moffat ("Reinventing Gravity") hoped future instruments to test gravitational waves will provide evidence of what the universe was like closer to the big bang. That would test Einstein's gravitational theory as well his own modified gravitational theory.
    Le cœur a ses raisons, que la raison ne connaît point. --Pascal

  4. #979
    On the road, but not! Danik 2016's Avatar
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    Interesting images of Jupiter regarding the study of its atmosphere shot by Juno mission. On the news today

    http://edition.cnn.com/2017/05/25/us...first-results/
    "You can always find something better than death."
    Jacob and Wilhelm Grimm, The Bremen Town Musicians

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  6. #981
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    There is a considerable evidence to support the Big Bang hence is called a theory and not a hypothesis. Theories can be adjusted but are generally well supported like the theory of evolution. Hypotheses are attempts to explain the facts.
    Karl Popper developed the concept of falsifiability and if a hypothesis cannot be falsified it can not be held to be scientific.

  7. #982
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    This isn't about the Big Bang, but about explaining the variability of the changing appearance of Tabby's Star:

    "This explanation not only offers an entirely natural account of what could be causing the star to dim, but also offers a prediction that (if true) would confirm their theory."

    Or are we not talking about the same thing?

  8. #983
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    Quote Originally Posted by Dreamwoven View Post
    I didn't realise there were other threads on astronomy. I did a search and came up with nothing. There are well over 600 threads on serious discussions alone, yet I got no hits. Perhaps I am doing something wrong in my searches...

    Anyway, space travel owes a lot to the work of someone I never heard of before - Michael Minovitch and the concept of gravity assist. See this website for details: http://gravityassist.com. Briefly until then rockets were shot up without using the slingshot technique of building up speed by this method, often several times, for example by circling the moon en route to develop enough slingshot speed to reach the goal.

    Big Bang is still a theory. I can't even see how it can be proved, but one never knows…

    Enormous strides in recent years, and have mapped all the inner planets and their moons with robot probes that do the job without risking human lives by sending people up into space.
    A theory is well founded unlike a hypothesis which is an attempt to explain the facts.
    The Big Bang is widely accepted and fits the bill just as the theory of evolution.
    Karl Popper has put forward the falsification test for scientific hypothesis if it cannot be falsified it is not scientific. Freud's hypothesis of the ego superego and id is such an unfalsifiable type. Popper points out that because a hypothesis cannot be falsified does not mean it is not useful.

  9. #984
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    Yes, I think we are not at odds on this point at all.

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    I don't publish a post every day, only if there is interesting news that catches my attention.

  11. #986
    Registered User tailor STATELY's Avatar
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    Enchant Me

    Your very being a desire for answer
    Lament not your unassailable mystery
    Enchant me with your dreams

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  12. #987
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    Great images of Juno's close pass of Jupiter! Thanks tailor.

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