Cape Canaveral, Jul 15: Scientists have confirmed a cave on the moon, not far from where Neil Armstrong and Buzz Aldrin landed 55 years ago, and suspect there are hundreds more that could house future astronauts.

An Italian-led team reported Monday that there's evidence for a sizable cave accessible from the deepest known pit on the moon. It's located at the Sea of Tranquility, just 250 miles (400 kilometers) from Apollo 11's landing site.

The pit, like the more than 200 others discovered up there, was created by the collapse of a lava tube.

Researchers analyzed radar measurements by NASA's Lunar Reconnaissance Orbiter, and compared the results with lava tubes on Earth. Their findings appeared in the journal Nature Astronomy.

The radar data reveals only the initial part of the underground cavity, according to the scientists. They estimate it's at least 130 feet (40 metres) wide and tens of yards (metres) long, probably more.

“Lunar caves have remained a mystery for over 50 years. So it was exciting to be able to finally prove the existence" of one, Leonardo Carrer and Lorenzo Bruzzone of the University of Trento, wrote in an email.

Most of the pits seem to be located in the moon's ancient lava plains, according to the scientists. There also could be some at the moon's south pole, the planned location of NASA's astronaut landings later this decade. Permanently shadowed craters there are believed to hold frozen water that could provide drinking water and rocket fuel.

During NASA's Apollo program, 12 astronauts landed on the moon, beginning with Armstrong and Aldrin on July 20, 1969.

The findings suggest there could be hundreds of pits on the moon and thousands of lava tubes. Such places could serve as a natural shelter for astronauts, protecting them from cosmic rays and solar radiation as well as from micro-meteorite strikes.

Building habitats from scratch would be more time-consuming and challenging, even when factoring in the potential need of reinforcing the cave walls to prevent a collapse, the team said.

Rocks and other material inside these caves — unaltered by the harsh surface conditions over the eons — also can help scientists better understand how the moon evolved, especially involving its volcanic activity.

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New Delhi (PTI): The country's largest airline IndiGo on Tuesday announced the appointment of former British Airways chief William Walsh as new CEO.

Walsh, an airline industry veteran, is currently the Director General of the International Air Transport Association (IATA).

Announcing the appointment of Walsh as the CEO, subject to regulatory approvals, IndiGo, in a release, said his tenure at IATA comes to a close on July 31 and is expected to join no later than August 3.

The announcement comes less than three weeks after the sudden exit of IndiGo CEO Pieter Elbers.

Walsh, popularly known as Willie, was formerly CEO of British Airways and IAG (International Airlines Group, a holding company, which owns Aer Lingus, British Airways, Iberia, Level and Vueling).

"As we enter a new phase of transformation and growth, I am delighted to welcome Willie to IndiGo.

"He is an iconic and accomplished aviation leader, and brings a rare combination of global perspective, operational expertise of having built strong customer-focused airlines, deep industry experience and a values-driven leadership, making him exceptionally suited to lead IndiGo at this pivotal cusp of growth," IndiGo Managing Director Rahul Bhatia said.