As far as universal limits go, the speed of light gets all the glory. But did you know there is a different speed limit for particles? It’s called the GZK limit, and some people think it has already been exceeded. Which has some pretty weird implications for the laws of the universe.
We had an X4.9 solar flare – the largest since 2012. The CME will NOT be geo-effective, but it heralds more to come and caused a radio blackout over much of the Western Pacific. Expect more flaring in the wake of this eruption.
Last night, a giant asteroid was supposed to streak by the Earth, close enough for us to catch a glimpse as it zipped by. Except it never showed, and now astronomers say they have no idea just where the 900-foot asteroid has gone. So, just how does one misplace an asteroid the size of three football fields? The most likely explanation is that its orbit was miscalculated.
Did a vast ocean once cover Mars’ northern plains? The idea has been hotly debated among scientists for the past 20 years, ever since Viking Orbiter images revealed possible ancient shorelines near the pole. Later findings even suggested that the primordial ocean—dubbed Oceanus Borealis—could have covered a third of the planet. Now a new study by Lorena Moscardelli, a geologist at the University of Texas, Austin, puts forward yet another line of evidence
Hank Green explains the science behind recent reports that physics great Stephen Hawking said “there are no black holes.” There are. They’re just super complicated.
The mystery of the world famous “Jelly Doughnut” rock on Mars has at last been solved by diligent mission scientists toiling away in dank research labs on Earth. The “Jelly Doughnut” rock achieved worldwide fame, or better yet infamy, when it suddenly appeared out of nowhere in pictures taken by NASA’s renowned Red Planet rover Opportunity in January. And the answer is – well it’s not heretofore undetected Martian beings or even rocks falling from the sky.
New clues are emerging about the mysterious streaks that appear on Mars’ surface during warm weather, though scientists still can’t say for sure that they’re caused by flowing water. The marks, known as recurring slope lineae (RSL), snake down some crater walls and other inclines when the mercury rises on the Red Planet. New research finds seasonal changes in iron minerals at RSL sites, suggesting that brines containing an iron antifreeze may flow there from time to time — but direct evidence of water remains elusive.
Conventional thinking has it that the universe and all the matter within it exploded out from a single point, the so-called Big Bang Singularity. But a German theoretical physicists says this never happened. Instead, the universe started empty and cold, slowly emerging from a deep freeze.
What if the universe itself is math? That’s what cosmologist Max Tegmark believes. In Tegmark’s view, everything in the universe — humans included — is part of a mathematical structure. All matter is made up of particles, which have properties such as charge and spin, but these properties are purely mathematical, he says. And space itself has properties such as dimensions, but is still ultimately a mathematical structure.
China’s first lunar rover successfully landed on the moon in December, but a malfunction is already jeopardizing its mission. China’s Jade Rabbit moon rover experienced a “mechanical control abnormality” according to state media said on Saturday, in what appears to be a setback for a landmark mission in the country’s ambitious space program
What do astronomers look for when they study exoplanets for signs of alien life? Hank Green explains how space telescopes are already yielding tantalizing clues of what other worlds might hold — including water! — and how the next generation of technology will be able to reveal to us
Renowned British scientist Stephen Hawking has stunned physicists by declaring there are no black holes. In a paper published online, Professor Hawking says instead of black holes there are grey holes. The fresh theory tries to address what is known as the black-hole firewall paradox, which has puzzled scientists for almost two years. The professor’s new grey hole theory would allow matter and energy to be held for a period of time before being released back into space. The theory offers a solution to the paradox.
A strange rock that looks like a doughnut has appeared on Mars, and scientists are closer to figuring out how it got there, a top NASA expert says. The small, round rock suddenly popped up in pictures taken 12 days apart by NASA’s decade-old Opportunity rover. On December 26, 2013, it was not there. On January 8, it was. But what is it?