Red, purple and green streamers of the aurora borealis dazzled viewers in North America on Friday and were seen much farther south than normal, with people in California, Arizona and Texas reporting they could see it, according to AccuWeather, Inc. Typically, the spectacular display is only visible in northern locales like Alaska, North Dakota, Canada and Iceland.
Science
James Webb Space Telescope Entering 'Period of Cooldown': What Does It Mean? – Gadgets 360
James Webb Space Telescope scientists said they have completed all major structural deployments of the $10-billion (roughly Rs. 74,000 crore) observatory in space. What now starts is the primary mission of the telescope, they added. James Webb Space Telescope was launched aboard an Ariane 5 rocket on December 25. It is so big that it had to be folded to fit in the rocket. After the rocket released the folded telescope in space, scientists carried out complex processes to deploy its tools, including the 21-foot, gold-coated primary mirror and its secondary mirror over the past week.
The James Webb telescope, which is set to replace the Hubble Space Telescope, will study the origin of the universe. Equipped with sophisticated cameras, James Webb will look at the celestial objects by capturing infrared light from them. In addition to studying our solar system, it is expected to learn more about distant worlds too.
The scientists said the telescope is now entering “a period of cooldown” and they will be less frequent with their updates but their work will continue.
Alexandra Lockwood, the project scientist for James Webb telescope’s science communications, said in a blog post that the telescope is moving into a slower phase of the commissioning process. Lockwood added that words weren’t enough to express the joy that the James Webb team has been experiencing. “From engineers to scientists to IT staff to graphic designers to administrative personnel (and more), we are all overjoyed with the incredible successes of the observatory to date,” Lockwood said.
In the next two weeks, scientists will move each of the 18 primary mirror segments of the James Webb Space Telescope, and the secondary mirror, out of their launch positions. Soon, the telescope will undergo a third mid-course correction to place it precisely in orbit around the second Lagrange point, commonly known as L2, nearly 1.6 million km from Earth. This will be James Webb’s final position, where its sunshield will protect it from direct sunlight and those reflected by the Earth and the Moon.
James Webb Space Telescope is a joint project of the US, European, and Canadian space agencies.
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A coronal mass ejection, an explosion of magnetic fields and plasma from the sun’s atmosphere, hit Earth early Friday with more force than initially forecast. These events can disrupt Earth’s magnetic field causing auroral displays, as well as disrupting satellites, communication and electric grids.
Read more: A Swedish Resort Lets You See the Northern Lights From Your Room
The US Space Weather Prediction Center had originally expected a G2 level storm Friday on its five-step scale, the event measured in at G4, one of the strongest triggered on Earth since 2017.
The impacts from the coronal mass ejection have trailed off, but energy coming from what scientists call a “coronal hole” will continue at least through Saturday and that could mean the aurora could be seen by viewers across Europe, Asia and North America through Sunday, the UK Met Office said on its website.
There are currently eight sunspot clusters visible on the side of the sun facing Earth, however another coronal mass ejection blasting toward us isn’t forecast, the UK Met Office said.
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An asteroid dubbed “city killer” for its size will pass harmlessly between the moon and the Earth Saturday evening.
The asteroid 2023 DZ2 will pass at a distance of over 100,000 miles, less than half the distance between the Earth and the moon. It’s about 160 feet long — about the size of an airliner. An asteroid that size could cause significant damage if it hit a populated area, hence its nickname.
“While close approaches are a regular occurrence, one by an asteroid of this size (140-310 ft) happens only about once per decade, providing a unique opportunity for science,” NASA Asteroid Watch tweeted.
Astronomers from the International Asteroid Warning Network, established about 10 years ago to coordinate international responses to potential near-Earth object impact threats, will be monitoring and learning from this asteroid.
NASA Asteroid Watch called the opportunity “good practice” in case “a potential asteroid threat were ever discovered.”
Near-Earth objects are asteroids or comets that pass close to the Earth’s orbit, and they generally come from objects that are affected by other planets’ gravity, moving them into orbits that push them close to Earth, according to the United Nations Office for Outer Space Affairs.
The European Space Agency maintains a risk list of 1,460 objects, which catalogs every object with a non-zero chance of hitting Earth over the next 100 years. Asteroid 2023 DZ2, which is in orbit around the sun, is not on the risk list.
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On Saturday, the 2023DZ2 will come within a third of the distance from the Earth to the Moon.
A large asteroid will safely zoom between Earth and the Moon on Saturday, a once-in-a-decade event that will be used as a training exercise for planetary defence efforts, according to the European Space Agency.
The asteroid, named 2023 DZ2, is estimated to be 40 to 70 metres (130 to 230 feet) wide, roughly the size of the Parthenon, and big enough to wipe out a large city if it hit our planet.
At 19:49 GMT on Saturday, it will come within a third of the distance from the Earth to the Moon, said Richard Moissl, the head of the ESA’s planetary defence office.
Though that is “very close”, there is nothing to worry about, he told AFP news agency.
Small asteroids fly past every day, but one of this size coming so close to Earth only happens about once every 10 years, he added.
The asteroid will pass 175,000km (109,000 miles) from Earth at a speed of 28,000 kilometres per hour (17,400 miles per hour). The Moon is roughly 385,000km (239,228 miles) away.
An observatory in La Palma, one of Spain’s Canary Islands, first spotted the asteroid on February 27.
Last week, the United Nations-endorsed International Asteroid Warning Network decided it would take advantage of the close look, carrying out a “rapid characterisation” of 2023 DZ2, Moissl said. That means astronomers around the world will analyse the asteroid with a range of instruments such as spectrometers and radars.
The goal is to find out just how much we can learn about such an asteroid in only a week, Moissl said. It will also serve as training for how the network “would react to a threat” possibly heading our way in the future, he added.
The asteroid will again swing past Earth in 2026, but poses no threat of impact for at least the next 100 years – which is how far out its trajectory has been calculated.
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