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Blog Entries from Radrook

  1. Stars seem pretty permanent don’t they?

    Stars seem pretty permanent don’t they? One generation goes and another arrives and there they still are, exactly as described before for hundreds of years. Yet all this is merely an illusion of permanence that doesn’t exist. The truth is that stars have lifetimes just as humans do but their lifetimes are measured in millions and billions and trillions of years instead of mere decades. The situation can be illustrated by comparing human lifespan to that of Mayflies that are born and don’t...
  2. Our Seemingly Nearby Moon

    Our Seemingly Nearby Moon The moon seems nearby when viewed on a clear night. Yet at its closest it is 225,623 miles away and 252,088 miles at its farthest giving it an average distance of 238,855 miles. So the difference between being farthest and nearest is 13,233 miles or approx a little more than four times the distance from the USA East Coast to its West coast. Which means that when the moon is farthest away, at 252,088 miles, you can almost fit 32 Earths within that distance. When...
  3. Our Very Distant Sun

    Our Very Distant Sun Many persons don't really appreciate just how tremendously distant our Sun really is because it can be so blistering hot on summer days and it seems so prominent in our sky. But in reality, what seems to be a fairly nearby sun is actually an almost unimaginably enormous distance away. Here are some examples to illustrate just how distant our sun really is. The Sun is approximately 93,000,000 miles (150,000,000 km) or 1 AU (Astronomical unit) from Earth. Light traveling...
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