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Space photo of the week: Astronomers make an ‘artificial star’ over Hawaii

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Space photo of the week: Astronomers make an ‘artificial star’ over Hawaii


What it is: The Gemini North telescope

When it was published: Feb. 7, 2024

Where it is: The Gemini Observatory at the summit of Mauna Kea in Hawaii

Why it’s so special: Stars twinkle — and that isn’t good if you want to study them using large telescopes. The twinkling comes from light passing through different layers of Earth’s turbulent atmosphere, which leads to a blurry, jumpy image in a telescope. Astronomers call this effect poor “seeing,” and it can interrupt astronomy for many nights — or, at least, it used to.

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On the Gemini North telescope, as on many modern ground-based telescopes, astronomers now use adaptive optics, which allows the telescope to correct for the distortions created by Earth’s atmosphere. From the top of Gemini North, a yellow laser called TOPTICA is used to make an artificial star on traces of sodium gas in the atmosphere about 50 miles (80 kilometers) over Earth. Computers then deform the telescope’s mirrors slightly to correct for any distortion.

That combination of lasers and computing power enables ground-based telescopes to make observations at resolutions that equal, and sometimes exceed, powerful space-based telescopes such as the Hubble Space Telescope and the James Webb Space Telescope (JWST). With the blurring effect of Earth’s atmosphere overcome, the ground-based Gemini North can use its larger mirrors to get higher-resolution images of stars, planets and galaxies. (Gemini North’s mirror is 26.6 feet, or 8.1 meters, in diameter, whereas JWST’s is 21.3 feet, or 6.5 m.) Astronomers hope these adaptive optics will allow ground-based telescopes to directly image exoplanets.

However, this photo and an accompanying image from a different angle are slightly misleading. The orangeyTOPTICA laser shown isn’t as bright to the naked eye; it looks that way only because this is a long-exposure image, as the star trails show.



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New downpours in Hawaii lead to more flooding on Oahu Island

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New downpours in Hawaii lead to more flooding on Oahu Island


TWICE reflect on a decade as a group: ‘There’s so much more we can do’ | AP interview

Speaking backstage at the Kia Forum during a stop on their ‘THIS IS FOR’ World Tour, TWICE sit down with Associated Press entertainment journalist Liam McEwan to reflect on a decade together — and the journey still unfolding. Nayeon, Jeongyeon, Momo, Sana, Jihyo, Mina, Dahyun, Chaeyoung, and Tzuyu open up about their anniversary release, “TEN: The Story Goes On,” featuring solo tracks from every member for the first time. The group also speaks about their evolving definitions of success, how comebacks come together through group chats and meetings, balancing solo ambitions and subunits, and pushing forward creatively without repeating themselves. They also discuss contributing “Takedown” to the Netflix hit “KPop Demon Hunters.”





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Severe flooding triggers road closures, evacuations in Manoa

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Severe flooding triggers road closures, evacuations in Manoa


HONOLULU (HawaiiNewsNow) – Portions of Manoa flooded Monday after several days of heavy rain.

According to Honolulu police, flooding was observed at multiple locations along East Manoa Road, including the intersections with Lowery Avenue, Akaka Place, and Oahu Avenue. That portion of the road is closed, and drivers are being asked to avoid the area.

Your HNN First Alert Weather Team declared Monday a First Alert Weather Day due to the threat of heavy rain and flash flooding.

The area was under a flash flood warning, with rain falling at 1 to 2 inches per hour and stream levels running very high.

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Flooding at Manoa Marketplace(Hawaii News Now)

Viewers have been sending Hawaii News Now photos and videos showing flooded roads and vehicles submerged in water at Manoa Marketplace.

Heather Damon said the rain “has not stopped for days. The ground is so saturated.”

The University of Hawaii at Manoa is asking students and employees to stay inside and off roads unless absolutely necessary until further notice, citing severe rain and flooding in some parts of campus.

In an alert, UH said officials are at faculty housing to address issues in the area. UH also said some student housing — Hale Wainani G and H — is being evacuated, and residents should follow all staff instructions.

Stay with Hawaii News Now for the latest First Alert Weather Day coverage.

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More pushback on county housing plan – Hawaii Tribune-Herald

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More pushback on county housing plan – Hawaii Tribune-Herald






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