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The prime minister says a one-on-one meeting with Chinese President Xi Jinping is still on the cards on the sidelines of the G20 summit.

As Anthony Albanese prepares to fly out on Friday to meet with key world leaders at a series of summits, he said the meetings came at a difficult time for the global economy.

While a meeting with his Chinese counterpart was a possibility after years of diplomatic tensions between the two nations, Mr Albanese did not confirm whether one would go ahead.

"We'll wait and see. I, of course, will be at the same summit as him at the G20 being held in Indonesia," he told Sydney radio 2GB on Friday.

"It's an important summit that comes at a really difficult time for the global community, we know that the economy is facing headwinds, we see global inflation rising as a result of Russia's illegal invasion."

Mr Albanese will travel to Cambodia on Friday for the East Asia summit, the first of multiple strategic leaders meetings in the next nine days.

In Phnom Penh, Mr Albanese is expected to catch up with his Cambodian counterpart Prime Minister Hun Sen and attend the ASEAN-Australia summit.

The summit comes as Cambodia and Australia mark the 70th anniversary of their diplomatic relationship.

Jobs, economic growth and regional resilience are expected to be high on the agenda.

Next week, Mr Albanese will join leaders from the world's top economies at the G20 summit in Bali.

It will be the second time the prime minister has travelled to Indonesia since Labor won the federal election in May.

Mr Albanese said security in the broader region will also feature at the summit.

"We have the strategic competition that's occurring in the region and a rising tension in some areas of the Indo-Pacific," he said.

"That's a difficult backdrop, but I look forward to engaging constructively at the G20, as well as with our neighbours of the East Asia Summit and the APEC meeting."

Indonesian President Joko Widodo has invited Mr Albanese and Indian Prime Minister Narendra Modi to deliver a keynote address at the Business 20 Summit.

Food security, energy and global health will be topics of discussion at the G20.

But the fallout from Russia's invasion of Ukraine and the state of the global economy is also set to be a major talking point.

While Russian President Vladimir Putin will not attend, Ukrainian President Volodymyr Zelenskiy is expected to take part virtually.

Overnight, the United States confirmed President Joe Biden will meet with the Chinese president on Monday in Bali.

It will be their first face-to-face meeting since Mr Biden became president in January 2021.

The summits will be an opportunity for leaders to discuss the economic instability faced across the globe in the wake of the pandemic.

© AAP 2022

A large section of the destroyed space shuttle Challenger has been found buried in sand at the bottom of the Atlantic Ocean more than three decades after the tragedy that killed a schoolteacher and six others.

NASA's Kennedy Space Center announced the discovery on Thursday.

"Upon first hearing about it, it brings you right back to 1986," Michael Ciannilli, a NASA manager in charge of the remains of both lost shuttles, Challenger and Columbia, said.

In a NASA interview, he said it was one of the biggest pieces of Challenger ever found in the decades since the accident.

Divers for a TV documentary crew first spotted the piece in March while seeking wreckage of a World War II plane.

NASA recently verified through video that the piece was part of the shuttle that broke apart shortly after lift-off on January 28, 1986.

All seven on board were killed, including the first schoolteacher bound for space, Christa McAuliffe.

The remnant is more than 4.5 metres by 4.5 metres; it is likely bigger because part of it is covered with sand.

Because of the presence of square thermal tiles, it is believed to be from the shuttle's belly, officials said.

The fragment remains on the ocean floor just off the Florida coast near Cape Canaveral, as NASA determines the next step.

It remains the property of the US government.

Ciannilli said the families of all seven Challenger crew members have been notified.

A History Channel documentary detailing the discovery airs on November 22.

© AP 2022

Elon Musk in his first email to Twitter employees has said remote work will no longer be allowed and that they will be expected in office for at least 40 hours per week, Bloomberg News reports.

Musk, who completed his $US44 billion ($A67 billion) deal for the popular social media platform just two weeks ago, has laid off half its workforce and several top executives and announced a series of actions including charging $US8 for the Twitter Blue subscription.

Musk also told employees that he wants to see subscriptions account for half of Twitter's revenue, the report said, citing the email.

The company did not immediately respond to a Reuters request for comment.

When Twitter reopened offices in March, it had said employees could still work from home if they wanted.

Musk's move reflects policies at his other companies, SpaceX and Tesla Inc, where he told employees to work in the office at least 40 hours a week, or leave.

"Sorry that this is my first email to the whole company, but there is no way to sugarcoat the message," Musk wrote, before he described a dire economic climate for businesses like Twitter that rely almost entirely on advertising to make money.

"Without significant subscription revenue, there is a good chance Twitter will not survive the upcoming economic downtown," Musk said.

"We need roughly half of our revenue to be subscription."

© RAW 2022