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What's up, sunshine?
And where in the world have I been?

Tucson, Arizona.

So cool meeting some of you when I was there.

But I am back.

And tonight, something big is happening.

8:04 p.m.

Eastern, the official start of fall in the northern hemisphere called the autominal equinox.

The what did you know?

The term equinox comes from the Latin word equinoxium, meaning equality between day and night.

Equinoxes occur twice a year when the sun rises and sets directly over the Earth's equator, causing day and night to be roughly the same.

This year's fall equinox is this coming Monday, September 22nd.

It marks the official start of the fall season.

In Japan, Autumn Equinox Day is a national holiday.

It marks a time to pay respect to deceased family members.

And from China to Great Britain, countries around the globe celebrate various harvest festivals rooted in ancient tradition.

Now to New York City, where some very influential people are meeting today.

The heads of state from around the world gathering for the 81st United Nations General Assembly.

The annual general debate is one of the biggest events in world diplomacy, bringing presidents, prime ministers, diplomats together for a week of speeches, negotiations, and high stakes meetings that can shape global policy, essentially the world's biggest group project.

US President Donald Trump is set to address the assembly today with the USIsrael war with Iran nearing the seven-month mark, while the wars in Gaza and Ukraine are also expected to feature prominently.

And there's another rapidly emerging issue, artificial intelligence.

The US is planning a high level event on AI safety amid growing warnings from researchers and tech executives about the risks increasingly powerful AI systems could eventually pose.

Open AI Sam Ultimate is expected to brief the UN Security Council about the risks AI companies say they are encountering.

AI and diplomacy will also take center stage in Washington this week where President Trump prepares to welcome Chinese leader Xiinping at the White House.

The meeting follows economic talks between US Treasury Secretary Scott Bessant and Chinese Vice Premier Ha Liong and sets the stage for potential highlevel talks between the two biggest powers in the AI space.

Our Will Ripley has more on what we can expect.

The talks between US Treasury Secretary Scott Besson and Chinese Vice Premier Hurly Fun, who oversees China's economy, really set the table for what we're expecting when President Donald Trump host Chinese leader Xiinping at the White House on Thursday.

The two leaders last met in Beijing in May.

And this time, three big issues are likely to dominate.

Technology, trade, and Taiwan.

Artificial intelligence is particularly important.

Bessence says the two sides have agreed to a new US China AI dialogue, including discussions about how the two leading AI powers in the world should notify each other if there was a serious AI related security incident.

And the backdrop to all of this is just how much China's position has changed.

When Trump first hosted Shi at Mara Lago in 2017, 9 years ago, China was much more vulnerable to US pressure on trade and technology.

But now she arrives in Washington leading a China that is far more confident, a major player in AI, robotics, chips, and even reusable rockets.

China recorded a roughly 1.2 trillion dollar global trade surplus last year, powered in part by exports including electric vehicles, solar panels, and chips.

And its dominance of rare earth supply chains gives Beijing real leverage over Washington.

And here in Taipei, the big question is how Trump and she handle the highly sensitive issue of Taiwan.

Beijing wants stronger US language opposing Taiwan independence.

And Trump has already called a pending 14 billion US arms package for Taiwan a negotiating chip.

So, we need to watch Trump's wording very closely here and watch what happens to that arms package, particularly after Taiwan's military drills on Friday, and above all, whether Taiwan somehow becomes part of a broader deal between Trump and she.

Now to the Florida panhandle where a fishing charter trip went out looking for the catch of the day and apparently they caught the US Air Force.

The Hotspots charter crew was fishing near Egglund Air Force Base, home of the US Air Force's weapons testing wing, when they found this, a nearly 10-ft military drone floating in the water.

Not your typical catch and release.

The aircraft appears to be an unarmed FLM136, an Americanmade drone designed to mimic the Iranian Shahed 136, a type of attack drone that's played a major role in recent conflicts.

An Air Force spokesperson confirmed a drone had gone down during testing and was missing from its inventory.

The fisherman did what any responsible crew would do, posted pictures online, and they jokingly called out for its owners to claim it.

Well, the ship's captain said some black SUVs arrived to retrieve it.

No word on what bait they were using, but uh this is one serious fish tail nonetheless.

Pop quiz shot.

What do scientists call planets outside of our solar system?

Star planets, exoplanets, extra solars, or outworlds?

If you said exoplanets, mission accomplished.

Most orbit other stars, but some free floating exoplanets, called rogue planets, are untethered.

NASA has confirmed the existence of more than 6,000 exoplanets, but believe there are billions out there somewhere.

NASA's Nancy Grace Roman Space Telescope, which launched last month, has officially captured its first photons of starlight just 22 days into its mission.

This after engineers activated its Roman wide field instrument, a massive 300 megapixel infrared camera.

It also tested Roman's coronagraph designed to block overwhelming glare from distant stars so scientists can better study exoplanets.

Think about trying to spot a firefly sitting next to a lighthouse from miles away, then being able to block the lighthouse.

Suddenly, you might see the firefly.

Scientists hope Roman will help investigate some of the universe's biggest mysteries like dark matter, dark energy in worlds we've never seen before.

Astrophysicist Neil deGrasse Tyson spoke to CNN about just how much we might learn.

>> The longest unsolved problem in modern astrophysics and it's been with us since the 1930s and it is what is the nature of the dark matter of the universe?

And what's different about this telescope from other space telescopes is that has a huge field of view.

Huge.

And in so doing, you can take in much more of the universe at once to see the impact that the dark matter has on the gathering of matter and energy in the universe.

And so it it Hubble got us up up close and personal in tiny fields of view.

This has a much wider field of view so that you can answer different questions about the structure, the large scale structure of the universe.

>> Question for you.

What happens when you bring one of golf's biggest stars out of retirement, put her on a team, add a giant simulator screen and a rotating green and have fans sitting practically on top of the action.

You get the WTGL, the new women's team golf league teeing off November 8th.

and Michelle Wii West will be competing for Los Angeles Golf Club.

From teenage phenom to US Women's Open Champion to retirement and now to a return.

I caught up with Michelle about her incredible journey.

You experienced pressure at an age when most of us were worried about homework and who we were going to sit beside at lunch.

There are so many >> those are things I was very worried as well.

>> Yeah.

>> So, this is great thing to ask you because you've overcome a lot.

There are so many young people now who feel like they have to be great now.

What's something about success that you understand that you wish 15-year-old Michelle knew back then?

>> Yeah, I think it's all about longevity.

I think it's at the end of the day, it's all about happiness.

That's all what life is.

Um I think no matter what you succeed, if you don't a feel good about it, if it doesn't fulfill you, I think that means nothing.

You know, at the end of the day, trophies are trophies.

And um you know, I think that with my career, I've been through so many ups and so many downs and obviously um succeeded very early in my life.

And I think it's just all about longevity.

It's all about finding purpose.

It's all about, you know, what's important to you as a human being.

Um I think winning is extremely important, but I think there's so much more that sports brings to you.

>> Today's story getting a 10 out of 10.

One of my very favorite stories to follow each year.

Get your brackets ready.

Fat Bear Week is here.

16 brown bears at Alaska's Catmy National Park are going head to very chunky head in a March Madness style tournament to see which bear has done the best job of packing on the pounds before winter.

So bears essentially are eating for 6 months to be able to hibernate for four to six months.

So their entire body slows down and they have to live exclusively on their fat reserves.

It's a very very challenging and interesting thing.

>> What began in 2014 as a fun way to celebrate the furry friend's progress has morphed into a global phenomenon.

Last year more than 1.7 million voters from more than 100 countries made their voices heard and a bear named 32 chunk took the crown.

The,200 pound round of Brown overcame a broken jaw to take home top prize.

He didn't just overcome adversity, he ate it for breakfast, probably with a side of salmon.

But this tournament isn't just about celebrating absolute units.

It's actually a celebration of a thriving ecosystem.

Fatterbears indicate healthy population of salmon at the park.

Critical source of food.

Voting starts today at explore.org/fatbearweek and we'll bring you the results.

May the chunkiest Ursid win.

And that's our 10.

But before I jet, shout out time.

Mrs.

Robinson and friends at James Clemens High School in Madison, Alabama.

Your former student, our current news associate here, Anit Bad Padi, has officially taken flight rise up.

And Mr.

A at Creek School in Vicelia, California, I hear this shout out means a pizza party.

So friends, tell Mr.

A to get you some plates and napkins cuz I technically just delivered.

Stay curious, keep learning, do some good wherever you are.

Shine bright sunshine.

I'm Koi Wire and we are CNN 10.