We were walking in the rising sun country park at approx 7pm. we were stood on a high hill while our dog played with another. as it was february, it was dark. we saw what my wife thought was a missile/bullett (it looked like a large bullet to me) fly above our heads, in amongst low cloud. it was a complete object sectioned into three parts. it had a round head, a middle section, and then and end section that was squared off. it didn't make a noise and it was really fast, passing in a straight line. it was almost translucent, a dull white/grey colour, it wasn't bright, and had no lights. it definitely wasn't similiar to a shooting star/plane - it was much bigger (it wasn't high enough either), and it didn't have any lights/trails. there was a man with us and he didn't see/hear it. my wife was facing it, and said what's that? i looked up immediately, and saw it fly above my head in total silence. the other man wasn't quick enough. when it crossed over our heads my wife was expecting some sort of explosion at the other end, but it just went into cloud and we lost it. we've never seen anything like it before or since. there are flight paths near by - but this 100% was not a plane. it was far too low, too fast, and no lights, and i saw the outline of it.