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WASHINGTON — The strange objects, one of them like a spinning top moving against the wind, appeared almost daily from the summer of 2014 to March 2015, high in the skies over the East coast. Navy pilots reported to their superiors that the objects had no visible engine or infrared exhaust plumes but that they could reach 30,000 feet and hypersonic speeds.

“These things would be out there all day,” said Lieutenant Ryan Graves, an F/A-18 Super Hornet pilot who has been with the Navy for 10 years and who reported his sightings to the Pentagon and Congress. “Keeping an aircraft in the air requires a significant amount of energy. With the speeds we observed, 12 hours in the air is 11 hours longer than we’d expect.”...

The pilots began noticing the objects after their 1980s-era radar was upgraded to a more advanced system. As one fighter jet after another got the new radar, pilots began picking up the objects but ignoring what they thought were false radar tracks.

But Graves said the objects persisted, showing up at 30,000 feet, 20,000 feet, even sea level. Then pilots began seeing the objects.

What was strange, the pilots said, was that the video showed objects accelerating to hypersonic speed, making sudden stops and instantaneous turns — something beyond the physical limits of a human crew.

Asked what they thought the objects were, the pilots refused to speculate.