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This undated photo provided by the U.S. Air Force shows...

This undated photo provided by the U.S. Air Force shows an X-37B Orbital Test Vehicle at NASA's Kennedy Space Center in Florida. The U.S. military's X-37B space plane blasted off on Thursday, Dec. 28, 2023, on another secretive mission that’s expected to last at least a couple of years. Credit: AP

The U.S. military's X-37B space plane blasted off Thursday on another secretive mission that’s expected to last at least a couple of years.

Like previous missions, the reusable plane resembling a mini space shuttle carried classified experiments. There's no one on board.

The space plane took off aboard SpaceX’s Falcon Heavy rocket from NASA's Kennedy Space Center at night, more than two weeks late because of technical issues.

It marked the seventh flight of an X-37B, which has logged more than 10 years in orbit since its debut in 2010.

The last flight, the longest one yet, lasted 2 1/2 years before ending on a runway at Kennedy a year ago.

Space Force officials would not say how long this orbital test vehicle would remain aloft or what's on board other than a NASA experiment to gauge the effects of radiation on materials.

Built by Boeing, the X-37B resembles NASA’s retired space shuttles. But they're just one-fourth the size at 29 feet (9 meters) long. No astronauts are needed; the X-37B has an autonomous landing system.

A SpaceX Falcon Heavy rocket carrying the X-37B spaceplane for...

A SpaceX Falcon Heavy rocket carrying the X-37B spaceplane for the U.S. Space Force lifts off from Kennedy Space Center in Merritt Island, Fla. early Saturday, December 23, 2023. The space plane blasted off on Thursday, Dec. 28, 2023, on another secretive mission that’s expected to last at least a couple of years. Credit: AP/Craig Bailey

They take off vertically like rockets but land horizontally like planes, and are designed to orbit between 150 miles and 500 miles (240 kilometers and 800 kilometers) high. There are two X-37Bs based in a former shuttle hangar at Kennedy.

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      Jim Vennard, 61, an electrical engineer from Missouri, received a $250 ticket for passing a stopped school bus in Stony Brook, a place he said he has never visited. NewsdayTV's Shari Einhorn reports. Credit: Newsday; Photo Credit: Jim Vennard; BusPatrol

      'I have never been to New York' Jim Vennard, 61, an electrical engineer from Missouri, received a $250 ticket for passing a stopped school bus in Stony Brook, a place he said he has never visited. NewsdayTV's Shari Einhorn reports.

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          Jim Vennard, 61, an electrical engineer from Missouri, received a $250 ticket for passing a stopped school bus in Stony Brook, a place he said he has never visited. NewsdayTV's Shari Einhorn reports. Credit: Newsday; Photo Credit: Jim Vennard; BusPatrol

          'I have never been to New York' Jim Vennard, 61, an electrical engineer from Missouri, received a $250 ticket for passing a stopped school bus in Stony Brook, a place he said he has never visited. NewsdayTV's Shari Einhorn reports.

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