Reference The temperature on Mars doesn't get much above 70 degrees F and it drop down to nearly minus 200 degrees F, making it a relatively cold planet.
Reference Based on what we can observe, the universe appears to be almost 28 billion light-years in diameter. However, it is far larger than that.
Reference Sir Isaac Newton invented calculus and explained optics. His most significant work involved forces and the development of a universal law of gravity.
reference A light-year is a measurement of the distance light travels in a single Earth year, which is important for measuring the vast distances of space