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    How long does it take a black hole to gain seven billion solar masses?

    We don't see matter rushing to a center point as though down a drain anywhere in the universe. Black holes' accumulation of matter must (except perhaps rare moments like a collision with another black hole) happen over a long period of time. Assuming a star, destined to be a black hole, began...
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    Does gravity slow time's passage?

    If gravity and acceleration are "cousins," How much faster does time proceed on Earth than floating motionless (or rather without acceleration) outside the Earth's gravitational field? Accelerating clocks tick slower, right? So too for clocks on Earth's surface, then? Also, with regard to...
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    Time at the edge of the universe

    Time at the "edge" of the universe If a distant galaxy is traveling away from us at the speed of light (due to the expansion of space), does this affect the passage of time? Can we really say that such a distant galaxy is receding at the speed of light and increasing speed the more distant it...
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    Einstein's Twin Paradox

    I know that the frame of reference determines that it is the stay-at-home twin who ages faster than the twin travelling at some fraction of light speed. Some years back, an experiment in which one of a pair of synchronized atomic clocks was placed on a commercial airliner and flown around the...
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    Looking back in time to the Big Bang

    If the universe is uniform no matter in what direction you look , then looking in two opposite directions, two observers, if each looks far enough will see the Universe at its earliest time -- The Big Bang. Therefore, the event of the Big Bang cannot be from a point singularity. It does not...
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    How will LHC know the Higgs when they see it?

    How will LHC know the Higgs when they "see" it? Amid the petabytes of information about to stream forth from Europe, how will Physics know if it has been wrong about the Higgs field and what may prove the premise? What's the best or worst case scenario, and what comes next?
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    Cosmic Ding

    Recently, a rather large nothing was discovered in the Universe (last August by the University of Minnesota team). This cosmic blank spot has no stray stars, no black holes, not even dark matter, and is a billion light years across. Is there a possibility that this could be the result of a...
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    Does time pass for photons?

    I understand that a photon has never been known to decay. Is this because, travelling at the speed they do, time has stopped for them? (relative to what we sub-luminals observe)
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    Evolution In A Bottle

    Is there any reason that evolution can't take place in an artificial environment? I contend that, just as hybrid swarms of plants in Nature can stabilize into new species, the process of prolonged hybridization can artificially create new species. I have been told that these hothouse plants...
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    Head And Heart

    The conscious mind’s had no real rationale to explain unreasoned romantic acts; endocrinology, however, shall provide new answers, based on sounder facts. This system, ruled by lobes within the brain, initiates emotions chemic’ly; adrenals startle, endorphins numb pain and hormones...
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    EM spectrum

    Are there wavelength limits at either end of the Electromagnetic spectrum? Is it true there could be a wavelength the size of the universe? What happens at the other end? Is there a quantum limit?
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    Quantum Melody

    I would be interested in knowledgeable comments on this work, and whether you find it amusing:
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    Superluminary travel at present

    Is there a part of today's observable universe that is travelling away from us at faster than light speed? (relatively speaking, of course) Is the known universe large enough for a cumulative expansion rate to exceed light speed?