'He's in our hearts': Family and friends still seek answers one year after Nathan Wise’s disappearance
It’s been a year since Nathan Wise went missing and his family is no closer to finding out what happened to him.
Data from the Hubble telescope has confirmed the existence of galaxies without dark matter, once thought to be an essential part of the celestial body’s makeup, a new study suggests.
The study, published in the June volume of Astrophysical Journal Letters, is based on 40 orbits of NASA’s Hubble Space Telescope and imaging from the Advanced Camera for Surveys which showed that the ultra-diffuse galaxy (UDG) known as “NGC1052-DF2” or “DF2” is lacking dark matter.
Dark matter, composed of particles that do not absorb, reflect or emit light, is widely considered to be an essential ingredient of galaxies. While dark matter cannot be seen directly, its gravitational force is like a glue that holds galaxies together, and governs the motion of matter that can be observed directly.
In 2018 Researchers had previously been working to measure the distance between DF2 and its neighbour UDG NGC1052-DF4 (DF4) which found “surface brightness fluctuations,” denoting compelling evidence of a lack of dark matter, according to a release.
DF2 and DF4 were found to have a large amount of very bright clusters of stars and are comparable in size to the Milky Way galaxy, but their total mass is only about one per cent of the Milky Way’s mass.
"Determining an accurate distance to DF2 has been key in supporting our earlier results," said researcher Shany Danieli in the release. "The new measurement reported in this study has crucial implications for estimating the physical properties of the galaxy, thus confirming its lack of dark matter."
The Hubble data also indicated that the galaxies were located slightly farther away than previously thought, supporting the idea they contain little to no dark matter. If DF2 was closer to Earth, the release states, it would be fainter and smaller.
"We went out on a limb with our initial Hubble observations of this galaxy in 2018," said Yale researcher Peter van Dokkum in the release. "I think people were right to question it because it's such an unusual result. It would be nice if there were a simple explanation, like a wrong distance. But I think it's more fun and more interesting if it actually is a weird galaxy."
Researchers plan to continue studying how ultra-diffuse galaxies are formed and what other unique properties they possess.
It’s been a year since Nathan Wise went missing and his family is no closer to finding out what happened to him.
Dozens of Ontarians are expressing frustration in the province’s health-care system after their family doctors either dropped them as patients or threatened to after they sought urgent care elsewhere.
An Ottawa pizzeria is being recognized as one of the top 20 deep-dish pizzas in the world.
Amazon's paid subscription service provides free delivery for online shopping across Canada except for remote locations, the company said in an email. While customers in Iqaluit qualify for the offer, all other communities in Nunavut are excluded.
The fire burning near Fort McMurray grew from 25 hectares to 5,500 hectares over the weekend.
Russia’s President Vladimir Putin began a Cabinet shakeup on Sunday, proposing the replacement of Sergei Shoigu as defence minister as he begins his fifth term in office.
Police are searching for a male suspect after a man was “slashed in neck” on Sunday morning in downtown Toronto and died.
There were some scary moments for several people on a northern Ontario highway caught on video Thursday after a chain reaction following a truck fire.
Health Canada announced various product recalls this week, including electric adapters, armchairs, cannabis edibles and vehicle components.
English, history, entertainment, math and geography: high school trivia teams could be quizzed on any of it when they compete at the Reach for the Top Nationals in Ottawa in June.
An Ottawa pizzeria is being recognized as one of the top 20 deep-dish pizzas in the world.
A family of fifth generation farmers from Ituna, Sask. are trying to find answers after discovering several strange objects lying on their land.
A Listowel, Ont. man, drafted by the Hamilton Tigercats last week, is also getting looks from the NFL, despite only playing 27 games of football in his life.
The threat of zebra mussels has prompted the federal government to temporarily ban watercraft from a Manitoba lake popular with tourists.
A small Ajax dessert shop that recently received a glowing review from celebrity food critic Keith Lee is being forced to move after a zoning complaint was made following the social media influencer’s visit last month.
The Canada Science and Technology Museum is inviting visitors to explore their poop. A new exhibition opens at the Ottawa museum on Friday called, 'Oh Crap! Rethinking human waste.'
The Regina Police Service says it is the first in Saskatchewan and possibly Canada to implement new technology in its detention facility that will offer real-time monitoring of detainees’ vital health metrics.
Just as she had feared, a restaurant owner from eastern Quebec who visited Montreal had her SUV stolen, but says it was all thanks to the kindness of strangers on the internet — not the police — that she got it back.