The area surveyed represents two-thirds of the Great Barrier Reef.
Almost half of the reefs studied had between 10% and 30% hard coral cover, while about a third of the reefs had hard coral cover levels between 30% and 50%, the report said.
While higher water temperatures led to a coral bleaching event in some areas in March, the temperatures did not climb high enough to kill the coral, the agency said.
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On February 15, 2013, above Chelyabinsk in Russia’s Southern Urals, the biggest meteorite that was ever seen this century entered the Earth’s atmosphere. Unusually, the meteorite’s surface dust survived its impact and is now the subject of in-depth research. Some carbon microcrystals in this dust have odd shapes. A group led by Sergey Taskaev and Vladimir Khovaylo from Chelyabinsk State University in Russia has recently published a paper on the morphology and simulations of the formation of these crystals in the European Physical Journal Plus.
A meteor’s surface develops meteorite dust as it enters the atmosphere and is subjected to very high temperatures and tremendous pressures. The Chelyabinsk meteor was exceptional in terms of its size, the intensity of the air burst it created as it exploded, the size of the biggest pieces that fell to Earth, and the destruction it caused. More importantly, it landed on snowy terrain, and the snow helped keep the dust intact.
Taskaev, Khovaylo, and their team first observed micrometer-sized carbon microcrystals in this dust under a light microscope. They, therefore, examined the same crystals using scanning electron microscopy (SEM) and found that they took up a variety of unusual shapes: closed, quasi-spherical shells and hexagonal rods. Further analysis using Raman spectroscopy and X-ray crystallography showed that the carbon crystals were, actually, exotically-shaped forms of graphite.
This could modernize the entire power grid with near-limitless energy.
Since scientists first demonstrated nuclear power 70 years ago, the second stage of nuclear power has remained just beyond our fingertips: nuclear fusion power. While promising, the ETA on the technology required to develop and build viable nuclear fusion has remained decades away.
Until now. Probably.
More people in the U.S. are now smoking marijuana than cigarettes, according to a Gallup poll.
Cigarette use has been trending downward during the past decades, with only 11% of Americans saying they smoke them in a poll conducted July 5 to 26, compared to 45% in the mid-1950s.
Sixteen percent of Americans say they smoke marijuana, with 48% saying they have tried it at some point in their lives. In 1969, only 4% of Americans said they smoked marijuana.
Some humans can detect the Earth’s magnetic field — via a neurological feature called magnetoreceptors — according to a recent study, reports Popular Mechanics.
First-year students have been left without accommodation at several universities as they prepare to start degrees next month.
Undergraduates at the University of Glasgow, Manchester Metropolitan University (MMU) and the University of the West of England in Bristol (UWE) were told this month that they would have to find their own accommodation owing to a lack of space in halls, according to the Financial Times.
At UWE, students were offered accommodation in Newport, Wales, nearly an hour away from the main campus in Bristol. It mirrored a situation last year at universities including York, which was forced to offer students accommodation in Hull.
Isaac arthur postscarcity civilizations.
A look into high-tech civilizations of the future who citizens seemingly lack for nothing.
This week, scientists announced that the James Webb Space Telescope, which among its many talents can analyze the atmospheres of exoplanets, just confirmed the presence of carbon dioxide on a world orbiting a sun some 700 light-years away. It’s the first observation of CO2 in a planetary atmosphere beyond our solar system.
But that discovery, made about a world very unlike our own, is just the first taste of what Webb’s instruments may soon reveal. Astronomers are eager to focus the telescope on planets like Earth, where liquid water, a crucial ingredient for life as we know it, is abundant. In the coming months and years, they will undoubtedly get their chance.
There are a number of promising Earth-like planets Webb could study in the near future, but in a paper published recently in The Astronomical Journal, scientists from the University of Montreal argue they’ve discovered one of the best such candidates yet.
