la. These essential facts and concepts will be used throughout the semester, and all students should memorize them. For our purposes, approximate answers are much better than precise answers. For example, the radius of the Earth should be remembered as 6000 km, rather than 6,378 km. The unit "LY" refers to light years. Complete the worksheet from the text and this week's lectures by supplying the requested quantities in round numbers, and also converting each number to scientific notation. Exact answers are not needed (35 marks). Quantity Approximate Value Scientific Notation Earth's Radius (km) Earth-Moon Distance (km) Astronomical Unit (km) Sun's Radius (km) Solar System Radius (AU) Speed of Light (km s-1) Length of Light Year (km) Milky Way's Radius (LY) Distance to Galactic Center (LY) Local Group Radius (LY) Virgo Supercluster Radius (LY) Radius of the Visible Universe (LY)How many times bigger is the Earth than the Moon? What is the ratio between the Earth's diameter and the distance to the Moon? TWhat is the ratio between the Sun's diameter and the Earth's diameter? How many times more massive is the Sun than the Earth? What is a light year? How many stars are within 12.5 light years of the 31111? How many galaxies have been found in the Local Group