Kaku also said that based on the video, "There's no indication of accelerating object in the air," and pilots in the area did not report anything out of the ordinary.
Ivan Orelrich, with Federation of American Scientists and an expert on missile technology, said it could be a jet contrail because if "it's horizontal goes a long, long distance, almost to the horizon, [then] it looks vertical."
He also said that a plane would have had multiple separate contrails that do not seem to appear on the video.
However, Orelrich said he could not be sure about what the video shows because it has characteristics of both a missile launch or perhaps an optical illusion involving a plane's contrail.
Orelrich said he does not believe it could have been a secret missile test.
"If they were going to do that and make it secret, they wouldn't launch it 35 miles from Los Angeles, they would launch it in the South Pacific or something, and so it's difficult to conjure up some story where that makes sense," he said.