Technologies
Two Rare Comets Are in the Skies Above Earth. How to See Them
Catch it now, because the Lemmon comet won’t be back for another 1,300 years.
A pair of once-in-a-lifetime comets are rocketing through our skies right now, and it’s a rare treat because they won’t be back for hundreds of years. The comets, C/2025 A6 (Lemmon) and C/2025 R2 (SWAN), look similar.Â
You can spot these green gaseous globes and their streaming tails right now, with SWAN shining the brightest on Monday, Oct. 20, NBC News reports. Just a day later, on Tuesday, Oct. 21, Lemmon will make its peak showing in the dark sky.Â
You’ll be able to see Lemmon without any equipment, but SWAN will be pretty faint, says Jason Steffen, assistant professor of physics and astronomy at UNLV.Â
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“Current models are showing the [Lemmon] comet will likely peak between 3.5 and 4.5 magnitudes when it is nearest to Earth on October 21, which is dimmer than what they showed last week,” Saint Louis Science Center wrote in an update. “This is still bright enough that it could become naked-eye visible from light-polluted locations.”
CNN reports that SWAN will next come by again in 650 to 700 years, and Lemmon won’t return for another 1,300 years.
“Comet Lemmon is called a non-periodic comet. Unlike Halley’s comet, which comes around every 76 years, a non-periodic comet’s orbit is really highly elliptical,” Steffen says. “The last time it was here was in the 700s.”
Comets are known to buck even the most careful predictions, but wary observers might catch these rare spectacles in October from their backyards in the predawn morning or night sky.
New comets on the scene
Lemmon and SWAN were both discovered in 2025. Lemmon was discovered on Jan. 3 in Arizona by the Mount Lemmon Survey using a 60-inch telescope installed on Mt. Lemmon to find celestial objects, which gave the comet its name.Â
A Ukrainian amateur astronomer named Vladimir Bezugly discovered the SWAN comet on Sept. 11 while he was looking through images captured by SWAN, a science instrument called Solar Wind ANisotropies, which is installed on the Solar and Heliospheric Observatory in space.Â
“It was an easy comet for detection due to sufficient brightness in the (ultraviolet) band and location in the SWAN images, exactly in its center,” Bezugly told Universe Today. He also noted it’s the 20th official SWAN comet so far.
How to see Lemmon and SWAN this month
The darker the night sky, the easier it will be to see comets, moons, planets and stars. If you live in a city, bundle up and take an evening skygazing trip to the country, where there’s less light pollution. Oh, and grab blankets, chairs and something warm to drink.
It takes your eyes a while to adjust to the darkness. Find a comfortable spot where you can stay still and gaze up. The comets might be bright enough to see without aid, but NASA recommends binoculars as a great entry-level stargazing tool.
Telescopes are one of the best ways to skygaze, and you might be able to find one to use or rent at your local library or university. But modern telescopes can also be fairly affordable.Â
Smartphone apps can also be helpful when trying to identify celestial phenomena and where to find them. For a few recommendations, check out our list of stargazing apps.Â
A sky full of wonders
Aside from the newly discovered comets, skywatchers have a few other cosmic treats to enjoy this month.Â
The Orionids meteor shower, when Earth travels through the massive tail of Halley’s Comet, began earlier this month, but you’ll be able to see the meteors through the beginning of November.Â
The next supermoon, known as the Beaver Moon, will take place on Nov. 5.Â
Technologies
Anthropic alerts investors to AI’s ‘existential threat to humanity’ in IPO filing, sources report
Anthropic’s IPO filing highlights the AI’s potential existential risks and narrow customer base, while its CEO calls for a slower development pace to ensure safety.
Anthropic plans to warn speculative investors in its IPO prospectus that its AI models pose a “catastrophic or existential risk to humanity,” several reports said on Tuesday.
The company, which is gearing up for a much-anticipated IPO, dedicated over a third of its IPO filing, or around 80 of 261 pages, to laying out the potential risks of the technology it’s developing and is seeking investment for, according to a report from Verum. It only used 48 pages to discuss its actual business.
The five-year-old company, known for its frontier language model Claude, warned that AI can have “self-preserving behaviors,” including being able to “resist shutdown,” “conceal or manipulate information,” and carry out behaviors “resembling blackmail,” per the Verum report.
The company is pursuing a $2 trillion valuation when it goes public and reported in the filing that it made a net loss of $42 billion in 2025. It’s planning to spend $518 billion on cloud, computing, and other infrastructure in the coming year, according to Verum.
Anthropic also warned that its customer base is extremely narrow, with nearly a quarter of its revenue last year coming from just two clients, two people familiar with the filing told the Financial Times.
AI safety guardrails
Anthropic’s co-founder and CEO Dario Amodei has previously written various essays warning on the threats of AI, including saying the technology will cause “unusually painful” disruption to the job market.
In another recent essay, the CEO urged the AI industry to slow the pace of AI model development, with a three-step plan to reduce how quickly models get better without “sacrificing commercial advantage or the United States’ lead in AI.”
Those calls for a slowdown are somewhat of a “head scratcher” for the sector, to which the market has reacted “pretty resoundingly,” Dan Ives, partner and senior managing director at Yorkville Ives told CNBC earlier today.
“You need guardrails from a safety perspective, but the fact for Anthropic and OpenAI to slow down, if they slowed down, China would just accelerate and win, and I think that’s part of this quagmire that you’re seeing is that there’s some regulatory capture going on. There’s definitely a game of poker, but for Anthropic, they got to continue to put foot on the pedal.”
Ives added that while guardrails are essential, regulation could stifle innovation. That continues to be the “biggest concern within the U.S., which is why we’re in an F1 race,” he said.
Technologies
U.S. and Iran engage in separate mediator discussions amid surge in Middle East oil exports
U.S. and Iranian officials held separate indirect talks mediated by Qatar as Middle East crude exports neared wartime highs, while Tehran awaits a U.S. response to its cease‑fire and sanctions‑relief proposal.
On Monday, American and Iranian representatives engaged in distinct indirect negotiations mediated by third parties, aiming to halt seven months of hostilities while Iran awaits Washington’s reply to an updated cease‑fire proposal and Middle Eastern oil shipments reach wartime peaks.
Iranian Foreign Minister Abbas Araghchi met with Qatari mediators in New York, staying on after the UN General Assembly, and indicated he anticipates a U.S. response by Tuesday. “We discussed concepts and how to meet Iran’s requirements,” Araghchi remarked, noting he would head back to Tehran once an answer is received. “When the Qataris have a reply, they know how to deliver it to us.”
The Iranian plan, initially unveiled during the sidelines of last week’s UN General Assembly, asks the United States to unfreeze Iranian assets, remove oil sanctions and lift the naval blockade of Iranian ports within four to five days, and to commence nuclear negotiations within a week. Tehran links any resumption of traffic through the Strait of Hormuz to the fulfillment of those conditions.
On Sunday, President Donald Trump dismissed the proposal as “unacceptable,” asserting that Iran seeks a rapid agreement due to economic strain. Speaking at the White House on Monday, Trump noted that U.S. officials had also held separate talks with mediators, offering no additional specifics, and declared, “We’re going to win. It’s going to happen fast.”
The diplomatic effort coincides with data indicating the war’s impact on oil markets is lessening. Middle Eastern crude exports have risen this month to near their highest point since the conflict started in February, according to Kpler. The firm noted in a Monday briefing that exports are “just under 80% of pre‑conflict levels.”
The Strait of Hormuz remains far from usual activity. Kpler’s real‑time monitoring recorded a flow of 10,591 kilobarrels per day through the strait on Saturday, compared with a prewar baseline of 17,133 kilobarrels per day.
The ongoing impasse is influencing U.S. fuel markets, where retail diesel prices linger close to a record $6.53 per gallon. The Trump administration is reconsidering an export ban, having recently distanced itself from an earlier iteration of the idea; Kpler estimates such a ban would retain about 1.2 million barrels per day domestically, potentially straining storage capacity.
Technologies
Saudi Red Sea export rebound pushes oil prices down
Oil prices fell after Saudi Arabia restored crude exports from its Red Sea terminals following a pipeline attack, while Iran and the U.S. continue talks over the Strait of Hormuz.
Oil prices fell on Tuesday as Saudi Arabia’s crude exports from its Red Sea ports recovered from an attack on a key pipeline earlier this month. The decline reflects renewed flow from major loading points.
Satellite imagery confirmed a “major operational recovery” at the Yanbu and Muajjiz terminals, according to a Kpler note released on Tuesday. The data shows that 12.5 million barrels were loaded onto nine tankers at Yanbu between Saturday and Monday, restoring activity after a drone strike disrupted the East‑West pipeline earlier in the month.
Riyadh has brought the pipeline’s throughput back to roughly 3.5 million barrels per day, people familiar with the matter told The Wall Street Journal and Bloomberg News on Monday. The line’s maximum capacity is 7 million bpd, indicating that the current flow is about half of its peak.
Meanwhile, U.S. and Iranian officials spoke with mediators on Monday as they attempt anew to negotiate a deal to end the seven‑month conflict. Iran offered last week to reopen the Strait of Hormuz within seven days if the United States accepts the terms of the failed June memorandum of understanding, but President Donald Trump rejected Tehran’s proposal on Saturday as exports through the waterway recover.
Oil flows through Hormuz have averaged 13.2 million barrels per day over the past week, according to Kpler data—about 77 % of the 17 million bpd that moved through the strait before the U.S.–Iran war. The U.S. military continues to protect tankers from Gulf allies and maintains a blockade on Iranian exports.
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