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Webb Telescope highlights star as it completes 'image stacking' alignment phase – electriccitymagazine.ca

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The bright light in the center of this black image is the star Webb uses to align its mirrors.

Webb has a telescope It has completed the third stage of aligning its mirrors, a crucial process for obtaining the latest images from this $10 billion space telescope. This feat comes just in time as the telescope heads into the second month of its three-month alignment period.

Since Webb reached his observing point in space, a place called L2, members of the NASA team have worked hard to get the telescope ready for science to begin. This process means using one star, HD 84406, as a guide to align the 18 primary mirrors.

Engineers have introduced 18 points of starlight into a cohesive pattern.

Engineers have introduced 18 points of starlight into a cohesive pattern.
picture: NASA/STScI/J. Dipascual

telescope Publish her full mirrors in late January, He saw his first light On February 4th until pick up a kind of Photograph On February 11, the ultimate goal is to make the mirrors identical to each other by about 50 nanometers, or 50 billionths of a meter. As Alize Fisher put it on file Recent NASA Blog“If the basic Webb mirror was the size of a US, then each part would be the size of Texas, and the team would need to align the heights of those Texas-sized parts with each other to an accuracy of about 1.5 inches.” TRefers to the orientations of mirrors made by humans here on Earth, a A million miles from the telescope.

On February 18, the mirrors lined up enough to organize 18 points of light Captured by each of the 18 primary mirrors. The next step was to focus those 18 views of the same star into a single point—literally by stacking the images on top of each other. This is done now, since the file The image stack alignment phase was completed on February 25, three days ahead of schedule. HD 84406 as seen by Webb is now a single point From the light, as it should be.

Lee Feinberg, director of the Webb Optical Telescope Element at NASA’s Goddard Space Flight Center, said in a statement. Agency release. “Years of planning and testing are paying off, and the team couldn’t have been more excited to see what the next few weeks and months will bring.”

Artist's depiction of the Webb telescope in the center, directed toward the lower left corner of the image.

Mirrors still function as a single instrument, although they need to be rather than one large telescope. Accurate combinations are essential. The fourth stage of mirror alignment, called coarse gradient, will now begin. This process involves pairing 20 different mirror pieces to cast light together; The team can use these results to discover where differences in clip heights reduce image sharpness.

The rough stages will be implemented in the next several weeks, after which they will come fine stages and align the telescope across the rest of Webb’s instruments (at the moment the team is only working on tweaking the primary mirror) and also the last, Final corrections. more dThe details of the alignment stages can be read about it here.

Webb will expand our knowledge oThe early universe, galaxies, and exoplanets, as well Some objects within our solar system. The The telescope does not replace the veteran Hubble Space Telescope. It will detect infrared and near infrared radiation, while Hubble works primarily in ultraviolet and visible light.

But Hubble was launched again in 1990. Webb will look at the universe along with his predecessor, but We will be looking back in time more than any device before it, with technology that was not possible 30 years ago.

Webb is still perfectly compatible and a bit scientifically feasible – estimating the ballpark is the middle of summer 2022 – but the fact that nothing has gone wrong so far is a testament to the hours and efforts of scientists and engineers eager to give the world a whole new look at the ancient universe.

MORE: The Webb Space Telescope takes a selfie while aligning its golden mirrors

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The body of a Ugandan Olympic athlete who was set on fire by her partner is received by family

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NAIROBI, Kenya (AP) — The body of Ugandan Olympic athlete Rebecca Cheptegei — who died after being set on fire by her partner in Kenya — was received Friday by family and anti-femicide crusaders, ahead of her burial a day later.

Cheptegei’s family met with dozens of activists Friday who had marched to the Moi Teaching and Referral Hospital’s morgue in the western city of Eldoret while chanting anti-femicide slogans.

She is the fourth female athlete to have been killed by her partner in Kenya in yet another case of gender-based violence in recent years.

Viola Cheptoo, the founder of Tirop Angels – an organization that was formed in honor of athlete Agnes Tirop, who was stabbed to death in 2021, said stakeholders need to ensure this is the last death of an athlete due to gender-based violence.

“We are here to say that enough is enough, we are tired of burying our sisters due to GBV,” she said.

It was a somber mood at the morgue as athletes and family members viewed Cheptegei’s body which sustained 80% of burns after she was doused with gasoline by her partner Dickson Ndiema. Ndiema sustained 30% burns on his body and later succumbed.

Ndiema and Cheptegei were said to have quarreled over a piece of land that the athlete bought in Kenya, according to a report filed by the local chief.

Cheptegei competed in the women’s marathon at the Paris Olympics less than a month before the attack. She finished in 44th place.

Cheptegei’s father, Joseph, said that the body will make a brief stop at their home in the Endebess area before proceeding to Bukwo in eastern Uganda for a night vigil and burial on Saturday.

“We are in the final part of giving my daughter the last respect,” a visibly distraught Joseph said.

He told reporters last week that Ndiema was stalking and threatening Cheptegei and the family had informed police.

Kenya’s high rates of violence against women have prompted marches by ordinary citizens in towns and cities this year.

Four in 10 women or an estimated 41% of dating or married Kenyan women have experienced physical or sexual violence perpetrated by their current or most recent partner, according to the Kenya Demographic and Health Survey 2022.

The Canadian Press. All rights reserved.

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The ancient jar smashed by a 4-year-old is back on display at an Israeli museum after repair

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TEL AVIV, Israel (AP) — A rare Bronze-Era jar accidentally smashed by a 4-year-old visiting a museum was back on display Wednesday after restoration experts were able to carefully piece the artifact back together.

Last month, a family from northern Israel was visiting the museum when their youngest son tipped over the jar, which smashed into pieces.

Alex Geller, the boy’s father, said his son — the youngest of three — is exceptionally curious, and that the moment he heard the crash, “please let that not be my child” was the first thought that raced through his head.

The jar has been on display at the Hecht Museum in Haifa for 35 years. It was one of the only containers of its size and from that period still complete when it was discovered.

The Bronze Age jar is one of many artifacts exhibited out in the open, part of the Hecht Museum’s vision of letting visitors explore history without glass barriers, said Inbal Rivlin, the director of the museum, which is associated with Haifa University in northern Israel.

It was likely used to hold wine or oil, and dates back to between 2200 and 1500 B.C.

Rivlin and the museum decided to turn the moment, which captured international attention, into a teaching moment, inviting the Geller family back for a special visit and hands-on activity to illustrate the restoration process.

Rivlin added that the incident provided a welcome distraction from the ongoing war in Gaza. “Well, he’s just a kid. So I think that somehow it touches the heart of the people in Israel and around the world,“ said Rivlin.

Roee Shafir, a restoration expert at the museum, said the repairs would be fairly simple, as the pieces were from a single, complete jar. Archaeologists often face the more daunting task of sifting through piles of shards from multiple objects and trying to piece them together.

Experts used 3D technology, hi-resolution videos, and special glue to painstakingly reconstruct the large jar.

Less than two weeks after it broke, the jar went back on display at the museum. The gluing process left small hairline cracks, and a few pieces are missing, but the jar’s impressive size remains.

The only noticeable difference in the exhibit was a new sign reading “please don’t touch.”

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B.C. sets up a panel on bear deaths, will review conservation officer training

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VICTORIA – The British Columbia government is partnering with a bear welfare group to reduce the number of bears being euthanized in the province.

Nicholas Scapillati, executive director of Grizzly Bear Foundation, said Monday that it comes after months-long discussions with the province on how to protect bears, with the goal to give the animals a “better and second chance at life in the wild.”

Scapillati said what’s exciting about the project is that the government is open to working with outside experts and the public.

“So, they’ll be working through Indigenous knowledge and scientific understanding, bringing in the latest techniques and training expertise from leading experts,” he said in an interview.

B.C. government data show conservation officers destroyed 603 black bears and 23 grizzly bears in 2023, while 154 black bears were killed by officers in the first six months of this year.

Scapillati said the group will publish a report with recommendations by next spring, while an independent oversight committee will be set up to review all bear encounters with conservation officers to provide advice to the government.

Environment Minister George Heyman said in a statement that they are looking for new ways to ensure conservation officers “have the trust of the communities they serve,” and the panel will make recommendations to enhance officer training and improve policies.

Lesley Fox, with the wildlife protection group The Fur-Bearers, said they’ve been calling for such a committee for decades.

“This move demonstrates the government is listening,” said Fox. “I suspect, because of the impending election, their listening skills are potentially a little sharper than they normally are.”

Fox said the partnership came from “a place of long frustration” as provincial conservation officers kill more than 500 black bears every year on average, and the public is “no longer tolerating this kind of approach.”

“I think that the conservation officer service and the B.C. government are aware they need to change, and certainly the public has been asking for it,” said Fox.

Fox said there’s a lot of optimism about the new partnership, but, as with any government, there will likely be a lot of red tape to get through.

“I think speed is going to be important, whether or not the committee has the ability to make change and make change relatively quickly without having to study an issue to death, ” said Fox.

This report by The Canadian Press was first published Sept. 9, 2024.

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