A group of astronomers believe they have found a new kind of "mini" supernovae that appear to share traits with other previously known types.
Until now, only core-collapse supernovae, the grand finale of stars approximately 10 to 100 times more massive than our sun, and Type Ia, which occur when certain conditions exist in binary (two-star) systems, were known to exist.
Originally published on Wed March 27, 2013 9:23 am
By Marcelo Gleiser
Last week, I started a discussion of what I call "The Three Origins," focusing first on the origin of life. Although we are far from knowing how non-living matter became living organisms on primitive Earth some 3.5 billion years ago (or more), or how to repeat the feat in the laboratory, I consider this the "easiest" of the three questions.
By the time today's K-12 students grow up, the challenges posed by climate change are expected to be severe and sweeping. Now, for the first time, new nationwide science standards due out soon will recommend that U.S. public school students learn about the climatic shift taking place.
Mark McCaffrey of the National Center for Science Education says the lessons will fill a big gap.
As global warming accelerates, the Arctic Ocean melts and the U.S. Navy estimates that by 2035 it may be ice-free for a month each year - that will mean more activity through the Northwest Passage, the Arctic shipping route which is already busier than ever. In an op-ed in Foreign Policy, James Holmes argues if and when that icy expanse opens regularly to shipping, the Arctic will need policing like any other marine thoroughfare, and he nominates the United States Coast Guard.
Originally published on Tue March 26, 2013 2:00 pm
By Adam Frank
You step down from the all-terrain camper and out into the bright sunlight. Your boots crunch on the cold desert soil. It's been three solid months in the office with just Sundays off (at best). But now, finally, you are out in the open once again. Above you the sky is its usual brown-hued butterscotch color. Ahead of you is the trail leading to the canyon. The plan is to spend the day walking a trail at the edge of Coprates Chasma, a canyon almost a thousand kilometers long (more than twice the length of the Grand Canyon, they say).
Environmentalists and beekeepers are calling on the government to ban some of the country's most widely used insect-killing chemicals.
The pesticides, called neonicotinoids, became popular among farmers during the 1990s. They're used to coat the seeds of many agricultural crops, including the biggest crop of all: corn. Neonics, as they're called, protect those crops from insect pests.
President Obama on Monday designated five new national monuments, including one in Maryland dedicated to anti-slavery activist Harriet Tubman and another setting aside Washington state's San Juan Islands.
"These sites honor the pioneering heroes, spectacular landscapes and rich history that have shaped our extraordinary country," President Obama said in a statement. "By designating these national monuments today, we will ensure they will continue to inspire and be enjoyed by generations of Americans to come."