Space technology awaited
About 5,880,000,000,000 miles in one light year of travel in space, the infinite journey of travel, not millions but, billions of miles will take lifetimes of space travel at the speed of light. Flight control is the next technology delaying the expansion of spacecraft expeditions. Sky-scraping speeds are attainable, but flight control requires technology not yet developed but impossible without it. No inter-space journeys can be started without revolutionary flight-control development.
Space engineering technology to develop a flying saucer-shaped craft that can travel at speeds unimaginable are theoretically, now possible. The spacecraft design, eg, like a flying saucer is the decisive challenge.
Many UFO sightings can be put down to spacecraft experimentations. Example: some of the experiments in the development of the Concord test flights for wing icing took place in the hot desert of Morocco, but you would think that wing-icing would be trialled in colder climates. A practice not commonly known.
The same thinking on UFO sightings. Test flights are not made public for self-explanatory reasons and are recorded as flying objects at high speeds – just like the Concord test flight of the 1960-70 flight.