Light-year is the distance light travels in one year. Light zips through interstellar space at 186,000 miles (300,000 kilometers) per second and 5.88 trillion miles (9.46 trillion kilometers) per year. We use light-time to measure the vast distances of space. It’s the distance that light travels...
Light-year is the distance light travels in one year. Light zips through interstellar space at 186,000 miles (300,000 kilometers) per second and 5.88 trillion miles (9.46 trillion kilometers) per year. We use light-time to measure the vast distances of space. It’s the distance that light travels...
I tell you what I did find out and found interesting the other week. The artic and Antarctic circles aren’t fixed, they are constantly moving. Reason being that the earth’s axis isn’t fixed. It constantly pivots by about 4 degrees IIRC, 2 degrees in either direction over hundreds of thousands of years. The circles are basically set by an area that has at least a one day period of 24 hours of total darkness in the winter and 24 hours of daylight in the summer. At the moment the earth is pivoting so that the circles are migrated North. When we get to the end of that pivot we’ll start pivoting back so the circles will start migrating south again.
Another interesting fact I found out the other week is that the part of planet earth that travels nearest to the sun and moon isn’t Everest despite it being the highest point on the planet. The earth isn’t a perfect sphere, it bulges at the equator so the part of the planet that gets nearest is a volcano in Central America, Tajumulco IIRC.
I tell you what I did find out and found interesting the other week. The artic and Antarctic circles aren’t fixed, they are constantly moving. Reason being that the earth’s axis isn’t fixed.
And also this is the only period in history that the Earth has had TWO polar ice-caps. In fact, except during a so-called "Ice Epoch" like the one we're experiencing now, it doesn't even have one polar ice cap.