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.
In theory, the closest the planets could come together would be when Mars is at its closest point to the Sun (perihelion) and Earth is at its farthest point (aphelion). In that case, the planets would be 33.9 million miles (54.6 million kilometers or 0.3646 AU) from each other.