Scientists may have made a profound discovery just on the edge of the solar system.
Quaoar, a dwarf planet with a ring, has some astronomers scratching their heads as it seems to defy long standing rules of planetary science: its rings extend out more than twice as far as previously thought allowable.
"It was unexpected to discover this new ring system in our solar system, and it was doubly unexpected to find the rings so far out from Quaoar, challenging our previous notions of how such rings form," said Professor Vik Dhillon, a co-author of the study from the University of Sheffield's Department of Physics and Astronomy.
The planet is considered a dwarf because it has enough mass to form a sphere but it has not "cleared the neighborhood around its orbit," according to NASA.
Astronomers first noticed Quaoar by chance after it passed in front of a star during its trek around the sun. Located just 620 million miles away from Pluto, it completes a revolution around the sun every 288 years. The size of the dwarf planet as measured via the Hubble Space Telescope found it to be 690 miles in diameter — much smaller than Earth's 7,926 miles.
A Montana judge on Monday sided with young environmental activists who said state agencies were violating their constitutional right to a clean and healthful environment by permitting fossil fuel development without considering its effect on the climate.
Alzheimer’s mainly affects the elderly, who are eligible for Medicare, but people under 65 — even, rarely, as young as their 30s — also can get diagnosed. They are more likely to have commercial coverage.
Some doctors say the drug should be held for three weeks before sedation to accommodate the delayed emptying of the stomach, which can cause patients to inhale food and liquid into their lungs.
