have you seen a UFO up close?

No- have you...

A "UFO" is an Unidentified Flying Object. I would think if you saw one up close you would be able to identify it, and it would no longer be Unidentified.

Personally, I have never seen anything in the sky that I wasn't able to identify sooner or later, but then I have spent a lot of time in my long life looking at the sky and learning to identify what I see. I'm not surprised that many people, who aren't familiar with what can be seen in the sky, would see things that they couldn't identify.

Ufo Up Close

Yes. I was in high school when I saw a metallic flying object I couldn't identify. It appeared to be rather huge and somewhat far away. Luckily I was able to eventually see it up close. It drifted down in front of some trees which gave my brain a reference. I then realized it was actually very small and pretty close. I walked over and picked it up once it landed. It was one of those mylar party balloons. If it had drifted behind those trees instead of in front of them I might have ended up as one of those crazy people who thinks I saw an alien space ship......

Yes i have, if i gave a description this would still be Unidentified. i could give a description an say it was like a ball of flames but would you think it was like a ball n had flames coming from it, i could give some detail an say it was round, but would you say well if its a ball its got to be round, if i said the reflective side wasnt would you think of a mirror, did it move fast i'd say yes 1' 10th of a second like bumble be "did it have wings (no)" did it make a noise or affect any surface area around me "no" was this real "yes"

I have seen a object flying in the sky who said it was aliens .

Seeing a flying object up close would make it awfully hard for me not to identify it.

Yes, the closest possible, from inside! I went in because of a vague promise that I would be "probed." Boy, was that ever a disappointment...

No never have you seen it

Do you live in Colorado by any chance?