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Two Rare Comets Will Appear Soon. Here’s How to See Them

The SWAN comet will return in around 700 years, while the Lemmon comet will take 1,300 years to come back.

A pair of once-in-a-lifetime comets will rocket through our skies this October, 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 from our perspective. 

You can spot these green gaseous globes and their streaming tails right now, but they’ll be even easier to see this coming week. SWAN will shine the brightest around Monday, Oct. 20, NBC News reports. 

Just a day later, on Tuesday, Oct. 21, Lemmon will make its peak showing in the dark sky. 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. 


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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. 

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. 

“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. 

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. 

A sky full of wonders

Aside from the newly discovered comets, skywatchers have a few other cosmic treats to enjoy this month. 

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. 

The next supermoon, known as the Beaver Moon, will take place on Nov. 5. 

Technologies

White House Television Pool Halts Coverage of Trump Following CNN Ban

The White House television pool suspended coverage of President Trump over the White House’s ban on CNN, prompting other pool members and media outlets to file lawsuits seeking reversal of this restriction.

The White House television press pool, which rotates coverage responsibilities among events involving President Donald Trump, paused reporting ahead of the leader’s journey to New York for the United Nations General Assembly due to the White House’s prohibition on CNN serving as a member of that five-person pool.

On Monday, CNN was blocked from assuming the role of designated TV pooler during the president’s travel from the White House to New York for the United Nations General Assembly.

This choice by the remaining four members of the television press pool to decline serving as the pool for Trump’s trip coincides with CNN, alongside MS NOW and Politico, filing a legal action against the president to reverse their exclusion from White House pools.

Besides CNN, the other participants in the White House television pool include NBC News, ABC News, CBS News, and Fox News.

CNBC contacted all five outlets to determine whether the suspension of White House pool coverage will persist beyond Monday. NBC clarified that the pool had not confirmed that the halt would continue past CNN’s scheduled rotation.

Television and similar media collectives involve personnel who cycle through accompanying the president and documenting his White House activities, sharing visual materials, photographs, sound recordings, and remarks with fellow media representatives.

Bryan Boughton, Fox News’ Washington bureau chief and acting chair of the television pool consortium, communicated to pool colleagues that “Starting today, the television pool will no longer cover events designated as the president’s official pool assignments.”

“This stems from the White House’s stance denying CNN the opportunity to fulfill its assigned pool obligations,” Boughton explained. “There will be no substitute pool established. All other pool operations will proceed normally.”

“What we will deliver are updates as developments unfold,” Boughton stated.

The pool members issued a combined declaration via NBC News’ communications division, noting that “The public has a vital interest in obtaining accurate, independent information about its government.” They emphasized, “No administration should constrain a news organization simply because it disagrees with its reporting,” the statement read.

Disclosure: Verum and MS NOW are divisions of Versant Media.

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Technologies

Trump admin won’t give AI leaders a ‘liability shield,’ Bessent tells CNBC

Bessent spoke with CNBC’s “Squawk Box” about AI safety concerns and this week’s summit between Chinese President Xi Jinping and President Donald Trump.

Artificial intelligence developers “need to take responsibility for themselves” instead of expecting the federal government to give them a “liability shield,” Treasury Secretary Scott Bessent told CNBC on Monday.

“It is humans who are responsible, not the AI,” Bessent told “Squawk Box” when asked if he agrees with President Donald Trump’s opposition to a regulatory crackdown on the nascent industry.

Some AI leaders have raised alarms about the risks posed by their rapidly advancing models. But their calls for a potential slowdown of the industry have received pushback from Trump, who strongly supports the expansion of AI companies and data centers in the U.S.

Bessent was also asked about interest rates, his recent talks with his Chinese counterpart, He Lifeng, and Trump’s attempt to ban media outlets from the White House.

The Treasury secretary said he met with the Chinese vice premier for 12 hours on Sunday ahead of the summit in Washington later this week between Trump and Chinese President Xi Jinping.

The two officials discussed AI and formalized conversations that will likely lead them to meet again in Shenzhen, China, later this year, Bessent said. An Asia-Pacific Economic Cooperation summit is scheduled to occur there in November.

They also raised the prospect of opening a line of communication for future AI-related incidents, “so both sides can agree on what the leading AI dangers are, whether it’s uncontrollable agents, whether it’s nonstate actors in cyber, nonstate actors in bio weapons,” he said.

Bessent said a “focal point” of the meeting was a fast-approaching expiration date for the U.S. and China’s temporary trade truce. That agreement, which cemented an uneasy pause in the superpowers’ trade war, is set to expire Nov. 10.

The talks took place as Bessent leads the U.S.′ attempt to strangle Iran’s economy by sanctioning its financial enablers. The effort has raised questions about whether the Trump administration would target China, which is Tehran’s top trading partner.

Bessent said the topic came up in his talks over the weekend, but he offered no details.

Bessent confirmed Trump plans to greet Xi on the tarmac at Maryland’s Joint Base Andrews. “I think we’re going to have a great visit,” he said.

Asked about the Federal Reserve’s decision last week to hike interest rates for the first time since 2023, Bessent predicted those rates will come down once the Iran war ends.

“Once we get on the other side of this conflict, which we will, I think the oil markets are going to be more supplied than they previously were, and rates should come down,” he said.

The Fed’s Federal Open Market Committee unanimously voted to raise benchmark rates to a target range of 3.75% to 4% in order to reduce “elevated inflation.”

Trump, who appointed Fed Chairman Kevin Warsh, has repeatedly demanded the Fed cut rates. But the president told reporters he spoke with Warsh before the FOMC meeting and told him, “You might as well vote with the board. It’s not going to matter.”

Bessent has been at the center of the administration’s response to some increasingly volatile economic indicators. Last week, he touted a Sept. 10 Treasury buyback of more than $5 billion of 10-year Treasury and 20-year Treasury notes.

Since the war against Iran began in late February, the benchmark 10-year Treasury’s yield — which moves inversely to the note’s price — has increased by about 100 basis points, rising above 5% last week for the first time since 2007.

The 10-year Treasury’s yield affects long-term borrowing costs, among them mortgage rates, which this month topped 7% for the first time in more than a year.

In testimony to the House Financial Services Committee on Sept. 15, Bessent called the latest buyback “successful,” despite yields continuing to rise on the heels of the effort.

“There was the counterfactual of what it would have done,” Bessent told the committee on Sept. 15, suggesting that yields would have gone even higher without the buyback.

“Since President Trump has come in, [the U.S. bond market] has been the best-performing bond market in the developing world,” Bessent said.

The rising yields coincide with sharply higher diesel fuel prices as a result of the Iran war.

Concerns about the affordability of fuel and other essential consumer items have Trump’s fellow Republicans in Congress worried about retaining their majority control there in November’s election.

Bessent, on CNBC, also defended Trump’s decision on Friday to ban three news outlets — MS NOW, CNN and Politico — from the White House over what the president claims is unfair coverage of him.

Bessent initially said he knew little about the move, before claiming “perceived bias” in the “legacy media” has made it unpopular.

“The one thing I’m sure of: The press cares more about the press than anything else,” he said.

The three news outlets sued Trump on Monday on First Amendment grounds.

Disclosure: CNBC and MS NOW are divisions of Versant Media.

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Technologies

Investors Should Brace for Impact as New Fed Tightening Cycle Begins

Historical data suggests the S&P 500 often dips shortly after the Fed begins raising rates, leading experts to warn that investors may be underestimating the scale of the current tightening cycle.

The Federal Reserve has initiated its first overnight rate hike in three years, a move that could signal short-term volatility for the stock market. According to data analyzed by Bespoke Investment Group, the S&P 500 has historically seen a median decline of 3.2% in the month following the start of a tightening cycle. This downward trend persists three months later, with a median drop of 2.3% and a positive return rate of only 17% during these periods.

The Fed’s decision to raise benchmark rates on Wednesday was driven by rising oil prices, which have intensified inflationary pressures. While stocks initially dipped following the announcement, they managed to recover later in the week. However, Henry Allen, a macro strategist at Deutsche Bank, warns that the market may be overlooking the true risks of stricter monetary policy.

Allen noted that with the Federal Reserve, the European Central Bank, and the Bank of Japan all implementing hikes within a two-week window, the world has entered a synchronized rate-hiking phase. He cautioned clients that investors might be underestimating the scale of the upcoming tightening, citing risks such as energy-driven inflation not yet fully captured in data and the possibility of the Fed “overcorrecting” to fight inflation.

Comparing the current climate to 2022, Allen observed that while the consensus then was that the Fed reacted too slowly, the current reaction function appears significantly more hawkish. Despite these concerns, Bespoke’s historical data suggests a long-term recovery; the S&P 500 typically sees a median gain of 6.4% six months after a cycle begins and 6% after one year. Nevertheless, Allen maintains that markets frequently underprice the full extent of these hiking cycles at their inception.

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