At 1.17 Earth masses and in the habitable zone, scientists says it’s orbiting the nearest star to our sun
Voyager 2 may have long ago left our solar system and headed out into interstellar space to explore the unknown, but scientists are still learning from the data it collected as it passed by the other planets in our system. A new analysis of 30-year-old data has revealed a surprising finding about the planet Uranus — the huge magnetic bubble surrounding it is siphoning its atmosphere off into space.
Atmospheres being lost into space can have a profound effect on the development of a planet. As an example, Mars is thought to have started out as an ocean-covered planet similar to Earth but lost its atmosphere over time. “Mars used to be a wet planet with a thick atmosphere,” Gina DiBraccio, space physicist at NASA’s Goddard Space Flight Center and project scientist for the Mars Atmosphere and Volatile Evolution, or MAVEN mission, said in a statement. “It evolved over time to become the dry planet we see today.”
Uranus’s atmospheric loss is driven by its strange magnetic field, the axis of which points at an angle compared to the axis on which the planet spins. That means its magnetosphere wobbles as it moves, which makes it very difficult to model. “The structure, the way that it moves,” DiBraccio said, “Uranus is really on its own.”
Due to the wobbling of the magnetosphere, bits of the atmosphere are drained away in what are called plasmoids — bubbles of plasma which pinch off from the magnetic field as it is blown around by the Sun. Although these plasmoids have been seen on Earth and on some other planets, they had never been observed on Uranus before the recent analysis of old Voyager 2 data.
“Imagine if one spacecraft just flew through this room and tried to characterize the entire Earth,” DiBraccio said. “Obviously it’s not going to show you anything about what the Sahara or Antarctica is like.”
“It’s why I love planetary science,” DiBraccio said. “You’re always going somewhere you don’t really know.”
The research is published in the journal Geophysical Research Letters.
COVID-19: Fanshawe team studies possible way to stop virus's spread in body – London Free Press (Blogs)
Fanshawe College researchers in London are studying a process that could lead to an effective treatment for COVID-19.
“When a virus enters the body, its ability to produce devastating effects is due to its capacity to make copies of itself while evading the body’s immune system,” said Abdulla Mahboob, manager of Fanshawe’s Centre for Applied Research and Innovation in Biotechnology (CARIB) labs, where the study is underway.
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The college team is testing a custom inhibitor they hope will block virus proteins from binding together to help the virus’s genetic material get past cell defences, he said. “If we stop the proteins from binding together, we can expose the virus to the cell’s immunity, which in turn will stop the spread of the virus itself in the patient.”
Scientists are testing the inhibitor using mammalian cells containing the specific proteins targeted in the study, with promising results, the college said.
If effective, the inhibitors would then be tested on the virus in lab-grown cells and work would begin to turn it into a viable treatment for the respiratory disease.
It’s the latest in a number of studies by college scientists, including one looking at the potential benefits of cannabis extract in treating blood clots and inflammation in life-threatening COVID-19 cases.
Take 2 for SpaceX's first astronaut launch with more storms – CTV News
CAPE CANAVERAL, FLA. —
SpaceX pressed ahead with its second attempt to launch astronauts for NASA — a historic first for a private company — but more stormy weather threatened more delays.
Elon Musk’s company came within 17 minutes Wednesday of launching a pair of NASA astronauts for the first time in nearly a decade from the U.S., before the threat of lightning forced a delay.
NASA Administrator Jim Bridenstine said managers were debating whether to bump the next launch attempt from Saturday to Sunday to take advantage of a slightly improved forecast at Kennedy Space Center.
At an outdoor news conference Friday, Bridenstine stressed the need for safety for astronauts Doug Hurley and Bob Behnken — no matter how many times it takes to launch them in a SpaceX Dragon capsule atop a SpaceX Falcon 9 rocket to the International Space Station.
“We cannot forget this is a test flight. This — is — a — test — flight,” he repeated. “We will go when everything is as safe as we can possibly make it.”
Forecasters put the odds of acceptable weather conditions Saturday at 50-50, with the outlook improving to 60% favourable on Sunday. Rain and clouds were the main concerns for both days.
While NASA urged spectators to stay home because of the pandemic, prime viewing spots at area parks and beaches were packed Wednesday. A weekend launch could draw even bigger crowds. The Kennedy Space Center Visitor Complex reopened Thursday, after a 2 1/2-month shutdown, and within a few hours, all 4,000 tickets were snapped up for Saturday’s launch attempt.
President Donald Trump and Vice-President Mike Pence were expected to return for the Saturday attempt. The number of employees, journalists and guests inside remained extremely limited because of the pandemic.
Whether an attempt is made Saturday or Sunday, “There will be no pressure. We will launch when we’re ready,” Bridenstine said.
The last time astronauts launched to orbit from the U.S. was in 2011 when Atlantis closed out the 30-year space shuttle program. Hurley was on that mission as well.
NASA hired SpaceX and Boeing in 2014 to get the ball rolling again — kicking off a commercial revolution for getting people to low-Earth orbit, according to officials. In the meantime, NASA has spent billions of dollars to buy seats on Russian Soyuz capsules for U.S. astronauts, in order to keep the space station staffed.
Boeing’s first astronaut flight, on the company’s Starliner capsule, is not expected until next year.
Bridenstine offered high praise for Musk on Friday and all his personal touches: spiffy spacesuits, Tesla rides to the launch pad, a colour-co-ordinated rocket and capsule — and more.
Musk has brought “vision and inspiration” to the American space program, Bridenstine said. While there’s occasionally a little tension between NASA and SpaceX, “he gives me a commitment and he delivers on that commitment. That has happened every single time.”
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.
Proxima b, a confirmed — potentially habitable — Earth-sized planet, is a mere 4.2 light years away – The Post – Ontario
A team of scientists from the University of Geneva has confirmed the existence of an Earth-sized planet orbiting the star closest to the sun. The planet, called Proxima b, is 1.17 times the mass of Earth and is located in the habitable zone of Promixa Centauri, 4.2 light years away.
Because Proxima Centauri is a red dwarf, much smaller and cooler than the sun, its habitable zone or Goldilocks zone — neither too hot nor too cold for liquid water to exist — is very close to the star. Proxima b orbits about 20 times closer to its star than Earth does to the sun, and a year on the planet is just over 11 Earth days long.
Red dwarf stars emit huge quantities of X-rays, and the scientists estimate the planet gets 400 times as much radiation as Earth. But Christophe Lovis, a researcher in the astronomy department of the university, was optimistic that this might not rule out the possibility of life, or at least habitability.
“Is there an atmosphere that protects the planet from these deadly rays?” he asks. “And if this atmosphere exists, does it contain the chemical elements that promote the development of life — oxygen, for example? How long have these favourable conditions existed?”
Proxima b could have a moon-sized neighbour.
Such questions will, he hopes, be answered in the next few years by the next generation of spectrometers, which will tease out data from the light of the star and its planet. The recent confirmation of Proxima b came from data from a spectrograph called ESPRESSO (Echelle Spectrograph for Rocky Exoplanet and Stable Spectroscopic Observations) mounted on the Very Large Telescope (yep, that’s its name) in Chile.
Proxima b was first detected by an earlier instrument called HARPS, or High Accuracy Radial Velocity Planet Searcher. “We were already very happy with the performance of HARPS, which has been responsible for discovering hundreds of exoplanets over the last 17 years”, says lead researcher Francesco Pepe. “We’re really pleased that ESPRESSO can produce even better measurements.”
In addition, data from ESPRESSO included a second signal that could indicate yet another planet orbiting even closer to the star. “If the signal was planetary in origin, this potential other planet accompanying Proxima b would have a mass less than one third of the mass of the Earth. It would then be the smallest planet ever measured using the radial velocity method,” says Pepe. Proxima b could have a moon-sized neighbour.
Despite the relative nearness of Proxima Centauri as the sun’s closest stellar neighbour, we will have to rely on spectrographic data for the foreseeable future. Our fastest interplanetary probes, the Voyagers and New Horizons, would take tens of thousands of years to reach Proxima Centauri, even if they were headed in that direction. A plan called Breakthrough Starshot imagines a tiny probe travelling at 20 per cent of light speed, and making the journey in 20 years, but it’s still very much on the drawing board.
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