UFO’s in the skies?

here seems to be a cover–up by some governments denying that any such things exist.
If someone can explain what I, along with a group of friends, saw in the sky then I will go along with them.
We were sitting on a beach late one night having a discussion and above the city in the distance there appeared to be the only star in the sky. The object was at about a 25 degree angle from where we sat.
To our amazement after about half an hour it suddenly flared up, increasing its size tenfold, then just as quickly resumed its original size and moved off at a speed at which none of us could ever imagine any object could travel.
For sometime we sat discussing just what we had seen, and came to the unanimous opinion was that it would be better not to reveal to anyone what we had seen as it was likely that we would not have been believed, and even considered ridiculous. However no one could ever convince me that we had not seen a genuine UFO.