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President Donald Trump signed an order Tuesday outlining his vision for a new "Space Force" that could one day become a separate military branch on an equal footing to the Army and Navy. Trump wants to create a space force to protect satellites, tackle vulnerabilities in space and assert US dominance in orbit. "We have to be prepared," Trump told reporters after signing the directive.

And it's a complete mystery as to how the radiation got there.

The F-15X will complement the F-22 and F-35 in tomorrow's aerial battlefields.

WASHINGTON (AP) — President Donald Trump on Tuesday directed the Pentagon to develop plans to create a new Space Force within the Air Force, accepting less than the full-fledged department he'd wanted.

CAPE CANAVERAL, Fla. (AP) — And now for the weather on Mars: NASA's newest lander is offering daily reports on the red planet's frigid winter.

Merck & Co Inc's cancer drug Keytruda failed a late-stage trial's main goals of slowing disease progression and extending the life of patients with a common type of liver cancer, the company said on Tuesday. The results could hamper prospects for the drug, which had received an accelerated approval from the U.S. Food and Drug Administration in November as a treatment for patients with advanced liver cancer who had been previously treated with Bayer AG's Nexavar. Keytruda, which is approved to treat several forms of cancer including skin and lung cancer, is Merck's biggest drug and brought in revenue of $7.17 billion last year.

The search giant, which reports results this week, could fare worse than rivals Alibaba Group Holding Ltd. and Tencent Holdings Ltd. because of its higher reliance on the advertising market, an increasingly competitive arena that tends to suffer with economic weakness. Alibaba’s core e-commerce has proven more resilient than traditional retail and a deepening thrust into realms such as cloud services helps juice top-line growth. Tencent is the standout: it’s gained more than 30 percent since an October trough, thanks in part to the cessation of a months-long business-busting freeze on new games.

Space startup SpaceIL plans to be the first private company to reach the lunar surface.

IBS isn't just a problem for grown-ups. Here are the red flags and how to help your child feel better.

MARSEILLE, France (AP) — A knife-wielding man on a wanted list was shot dead by police Tuesday shortly after he injured four people, one seriously, on a major street in the French city of Marseille, the local prosecutor said.

In 1975, geologist Wallace Broecker penned a scientific paper warning about the still little-discussed concept of "global warming." Forty-four years later Broecker has died at 87, but not before proving himself a legendary earth scientist, repeatedly underscoring that amassing carbon dioxide in the atmosphere has stoked relentless climate change. Ancient air found in ice cores proves, indisputably, that Earth's carbon dioxide (CO2) concentrations are the highest they've been in at least 800,000 years — though other measures show that CO2 concentrations are now likely the highest they've been in 15 million years. The planet is responding: 18 of the last 19 years have been the warmest on record.  Broecker publicly warned about climate change in a 1975 report published in the academic journal Science entitled "Climatic Change: Are We on the Brink of a Pronounced Global Warming?"  "Of the climatic effects induced by man, only that for CO2 can be conclusively demonstrated to be globally significant," Broecker wrote. Animation showing the evolution of global mean temperature vs. carbon dioxide concentration since 1850, now updated to include 2018.Though 2018 is a bit cooler than recent years, it still is one of the warmest years ever and lies close to the trend line of #GlobalWarming. pic.twitter.com/eK7zvUqWyT — Robert Rohde (@RARohde) February 10, 2019 Broecker's analysis turned out to be largely accurate.  He warned that Earth would soon experience an accelerated warming trend. "It is possible that we are on the brink of a several-decades-long period of rapid warming," Broecker wrote. And over the last 40 years, Earth has indeed experienced a rapid warming trend that has been closely watched and confirmed by NASA, the National Oceanic and Atmospheric Administration (NOAA), and outside agencies and organizations.  "The trends are due almost entirely to us (and specifically the fossil-fuel related increases in CO2)," Gavin Schmidt, the director of the NASA Goddard Institute for Space Studies, told Mashable.  What's more, in the mid-1970s, Broecker predicted that carbon dioxide would become an increasingly dominant influence. He anticipated that naturally-running climate cycles — which scientists would later pinpoint as decades-long major cooling trends in the Pacific Ocean — had subdued global average temperatures in the late 1940s through the 1970s but would soon end. (This period has been incorrectly labeled as evidence of long-term "global cooling"). This meant that historically-high carbon dioxide levels would soon show their amassing strength, as the temporary cooling run "bottomed out."  „He was also the first person ever to recognize the Ocean Conveyor Belt (which he named).“ Wally was a great inspiration to me (including inspiring me to contradict him, which he welcomed). It was a privilege to work with him for years in the Panel on Abrupt Climate Change. https://t.co/cfxRZJoDyg — Stefan Rahmstorf (@rahmstorf) February 18, 2019 "Once this happens, the CO2 effect will tend to become a significant factor and by the first decade of the next century we may experience global temperatures warmer than any in the last 1000 years," Broecker wrote. “We’re playing with an angry beast — a climate system that has been shown to be very sensitive,” Broecker later told the Associated Press, in 1997. SEE ALSO: Trump fails to block NASA's carbon sleuth from going to space Now in the second decade of the 21st century, humanity has likely experienced the highest temperatures on Earth since around 120,000 years ago — back when hippos roamed Europe.  "This period is now the warmest in the history of modern civilization," federal scientists concluded in the congressionally-mandated Fourth National Climate Assessment. Baseball spring training starts this week.Predicting today whether CO2 in 2100 will be ~1000 ppm, or only half that, is like guessing who will play in the World Series in October.Nonetheless, the consequences of our CO2 emissions over the next few decades are profound. pic.twitter.com/pUf5VVlBAk — Kris Karnauskas (@OceansClimateCU) February 19, 2019 Today, scientists know that about half of the carbon dioxide emitted into the atmosphere by humans is absorbed by the oceans, forests, and vegetation. That's a good thing. But the looming problem is that these natural "sinks" of carbon are maxed out. The planet can't keep up with amassing carbon emissions, which might not even peak for another decade.  Critically, Broecker noted that Earth's rising temperatures are expected to continue rising, though this rise may slow down or speed up as other natural climate cycles kick in. But these temporary events can't halt a relentless warming trend.  "Future natural cycles would merely modulate this ever-steepening rise," Broecker wrote.  In the end, Broecker was right about the ensuing decades — and beyond — of warming, years before reliable Earth-monitoring satellites were launched into space. "We may be in for a climatic surprise," he said. WATCH: Ever wonder how the universe might end?

Cystic acne is painful and notoriously hard to treat. Find out the best way to get rid of cystic breakouts from top dermatologists.

It only broke the sound barrier in terms of ground speed, mind you.

The "Super Snow Moon," the second of this year's three supermoons, will appear about 10 percent larger than an average full moon.

And it might have implications for surgery, space travel, and national security.

President Donald Trump on Tuesday took a step toward creating a U.S. Space Force, a new branch of the military dedicated to handling threats in space. Trump signed Space Policy Directive 4, which puts in place the foundation for a legislative initiative that could establish a Space Force as a new military service comparable to the U.S. Marines. In an oval office signing ceremony, Trump said the Space Force is a national security priority.

ORLANDO, Fla. (AP) — Peter Cosgrove, a former Associated Press photographer in Florida who covered more than 100 space shuttle launches, the Elian Gonzalez saga, and the presidential recount, has died. He died of a heart attack in his sleep on Saturday in Orlando, Florida at the age of 84.

Charo's Husband Had Skin Disease, Depression Before Suicide

President Donald Trump is set to sign a new directive Tuesday aimed at formally establishing a new space-focused military branch that will begin as an extension of the U.S. Air Force, yet another step toward making the “Space Force” a reality. Trump, on the campaign trail and elsewhere, had originally touted that the Space Force would work as its own branch on par with the status of the Air Force, Army and Navy, promising "American dominance in space."But the ‘Space Policy Directive 4’ has been scaled back from that and puts it more in line with the status of the Marine Corps under the Navy – a route seen as more palatable to skeptics in Congress. It’s a “step toward a future military department for space,” the official added.

Researchers discovered a giant cavity inside Thwaites Glacier, considered one of the most dangerous in the world. What happens if it collapses?