The moon's orbit around theEarthis not a perfect circle. It has an average distance of 238,000 miles (382,900 km) from Earth, but its apogee and perigee — the closest and farthest approaches from Earth — change every lunar month. "The main reason why the orbit of the moon is not ...
If you are interested in viewing the solar system planets up close, you’ll want a telescope with plenty of aperture. A Dobsonian telescope with a mirror of at least 8″ is a great choice, but 10″ or 12″ is even better. If you want to photograph planets in detail, a high magnifi...
The observable universe is about 93 billion light-years in diameter, but the entire universe may be much larger. 11 Space Space exploration has advanced through manned missions, space telescopes, and robotic spacecraft, expanding our knowledge of the solar system. The Hubble Space Telescope has pr...
That's my big worry on the US economy, the government sector is expanding while manufacturing drops. What will China do when people don't accept a dollar a day?They will do what the US has done so well...look for markets in cash poor countries where people are happy to make t-shir...