Eyeglasses made of nylon were introduced in the late 1940s. Because of brittleness and other problems, eyeglass manufacturers switched to blended nylon (polyamides, co-polyamides and gliamides). Today's blended nylon frames are both strong and lightweight.
Venus is the closest size to Earth and is sometimes called Earth's sister planet.. Its diameter is 95% of Earth's but its mass is only 81% as much.
Mercury is the smallest planet. Mercuryâs diameter is 4879 km, while Earthâs is 12,756 km. In fact, Mercury is not much larger than our Moon, which has a diameter of 3475 km.It is even smaller than a couple of other moons in the Solar System, such as Ganymede (of Jupiter) and Titan (of Saturn).ercuryâs diameter is 4879 km, while Earthâs is 12,756 km. In fact, Mercury is not much larger than our Moon, which has a diameter of 3475 km.