Here's where Canadians are living abroad: report
A recent report sheds light on Canadians living abroad--estimated at around four million people in 2016—and the public policies that impact them.
Feeling like you are being watched? It could be from a lot farther away than you think.
Astronomers took a technique used to look for life on other planets and flipped it around -- so instead of looking to see what's out there, they tried to see what places could see us.
There's a lot.
Astronomers calculated that 1,715 stars in our galactic neighbourhood -- and hundreds of probable Earth-like planets circling those stars -- have had an unobstructed view of Earth during human civilization, according to a study Wednesday in the journal Nature.
"When I look up at the sky, it looks a little bit friendlier because it's like, maybe somebody is waving," said study lead author Lisa Kaltenegger, director of the Carl Sagan Institute at Cornell University.
Even though some experts, including the late Stephen Hawking, warn against reaching out to aliens because they could harm us, Kaltenegger said it doesn't matter. If those planets have advanced life, someone out there could conclude that there is life back here based on oxygen in our atmosphere, or by the radio waves from human sources that have swept over 75 of the closest stars on her list.
"Hiding is not really an option," she said.
One way humans look for potentially habitable planets is by watching them as they cross in front of the star they are orbiting, which dims the stars' light slightly. Kaltenegger and astrophysicist Jacqueline Faherty of the American Museum of Natural History used the European Space Agency's Gaia space telescope to turn that around, looking to see what star systems could watch Earth as it passes in front of the sun.
They looked at the 331,312 stars within 326 light-years of Earth. One light-year is 5.9 trillion miles. The angle to see Earth pass in front of the sun is so small that only the 1,715 could see Earth at some point in the last 5,000 years, including 313 that no longer can see us because we've moved out of view.
Another 319 stars will be able to see Earth in the next 5,000 years, including a few star systems where scientists have already spotted Earth-like planets, prime candidates for contact. That brings the total to more than 2,000 star systems with an Earth view.
The closest star on Kaltenegger's list is the red dwarf star Wolf 359, which is 7.9 light-years away. It's been able to see us since the disco era of the mid 1970s.
Carnegie Institution for Science planetary scientist Alan Boss, who wasn't part of the study, called it "provocative." He said in addition to viewing Earth moving in front of the star, space telescopes nearby could spot us even if the cosmic geometry is wrong: "So intelligent civilizations who build space telescopes could be studying us right now."
So why haven't we heard from them?
It takes a long time for messages and life to travel between stars and civilizations might not last long. So between those two it's enough to limit the chances for civilizations to exchange "emails and TikTok videos," Boss said in his own email. "So we should not expect aliens to show up anytime soon."
Or, Kaltenneger said, life in the cosmos, could just be rare.
What's exciting about the study is that it tells scientists "where to point our instruments," said outside astronomer Seth Shostak of the SETI Institute that searches for extraterrestrial intelligence. "You might know where to look for the aliens!"
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Follow Seth Borenstein on Twitter at @borenbears.
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The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute's Department of Science Education. The AP is solely responsible for all content.
12:41ET 23-06-21
A recent report sheds light on Canadians living abroad--estimated at around four million people in 2016—and the public policies that impact them.
Polish President Andrzej Duda says while no decision has been made around whether Poland will host nuclear weapons as part of an expansion of the NATO alliance’s nuclear sharing program, his country is willing and prepared to do so.
Harvey Weinstein’s lawyer said Saturday that the onetime movie mogul has been hospitalized for a battery of tests after his return to New York City following an appeals court ruling nullifying his 2020 rape conviction.
One person was killed in a six-vehicle crash on Highway 400 in Innisfil Friday evening.
Ontario is now home to an invasive and toxic worm species that can grow up to three feet long and can be dangerous to small animals and pets.
A number of LGBQT+2s groups in Central Alberta are pushing back against a request from the Red Deer South UCP constituency to reinstate MLA Jennifer Johnson into the UCP caucus.
It's one thing to say you like Taylor Swift and her music, but don't blame CNN's AJ Willingham's when she says she just 'doesn't get' the global phenomenon.
Sophie Gregoire Trudeau says there is 'still so much love' between her and Prime Minister Justin Trudeau, as they navigate their post-separation relationship co-parenting their three children.
A girl and a boy, both 14 years old, made their first appearance today in a Halifax courtroom, where they each face a second-degree murder charge in the stabbing death of a 16-year-old high school student.
As if a 4-0 Edmonton Oilers lead in Game 1 of their playoff series with the Los Angeles Kings wasn't good enough, what was announced at Rogers Place during the next TV timeout nearly blew the roof off the downtown arena.
Mounties in Nanaimo, B.C., say two late-night revellers are lucky their allegedly drunken antics weren't reported to police after security cameras captured the men trying to steal a heavy sign from a downtown business.
A property tax bill is perplexing a small townhouse community in Fergus, Ont.
When identical twin sisters Kim and Michelle Krezonoski were invited to compete against some of the world’s most elite female runners at last week’s Boston Marathon, they were in disbelief.
The giant stone statues guarding the Lions Gate Bridge have been dressed in custom Vancouver Canucks jerseys as the NHL playoffs get underway.
A local Oilers fan is hoping to see his team cut through the postseason, so he can cut his hair.
A family from Laval, Que. is looking for answers... and their father's body. He died on vacation in Cuba and authorities sent someone else's body back to Canada.
A former educational assistant is calling attention to the rising violence in Alberta's classrooms.
The federal government says its plan to increase taxes on capital gains is aimed at wealthy Canadians to achieve “tax fairness.”