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Earth News

(3 posts)
  • Started 3 weeks ago by Steve R.
  • Latest reply from Steve R.

  1. Steve R.
    Member

    Ancient Shell Has Revealed Exactly How Much Shorter Days Were 70 Million Years Ago. Good article covers a lot of related aspects, one of them being how far the Moon recedes from the earth every year.

    Posted 3 weeks ago #
  2. JohnWThiel
    Member

    The Earth was rotating faster then, right?

    Posted 3 weeks ago #
  3. Steve R.
    Member

    From the article: "For instance, by studying how changes in solar radiation recorded in ancient rock matched up with the Sun's cycles over tens of thousands of years, scientists were recently able to determine that Earth's days were just 18 hours long around 1.4 billion years ago."

    "The team used this aspect to calculate the length of day when the bivalve lived. They determined that their fossilised T. sanchezi had lived for nine years. Then, they counted the rings in each year, both visually and chemically. If you did that today, you'd get 365 rings per year - but instead, they got 372.

    We know the length of a year has remained more or less the same, since Earth's orbit hasn't changed. So that means the length of a day - determined by the speed of Earth's rotation - must have changed, lengthening since then from 23.5 to 24 hours."

    ----------------------------------------------------------------------

    Breaking news, or it was 10,000 years ago. An early human settlement was evidently destroyed by a meteor impact. "Meteor impact destroyed first human settlement 10,000 years ago"

    "Researchers find evidence of a cosmic impact that caused the destruction of one of the world’s earliest human settlements. (Image: UC Santa Barbara)

    Scientists believe that the race of dinosaurs was wiped out by an asteroid millions of years ago. Now, new research suggests that an early settlement of human also suffered the same fate around 10,000 years ago by a huge chunk of space rock.

    Archaeologists from the University of California, Santa Barbara, claim that Tell Abu Hureyra, which lies in modern-day northern Syria, was annihilated by the cosmic impact of a fragmented comet. The site is well known amongst archaeologists for being the place where first human hunter-gatherers turned farmers lived 13,000 years ago. The place is since under what is known as Lake Assad now."

    Posted 3 weeks ago #

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