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92How many satellites orbit the Earth?
Space is big, but it can still get crowded up there. The recent collision between two orbiting satellites, including one Iridium satellite, was just an accident waiting to happen, according to debris scientists at Johnson Space Center in Houston....
26 comments
87Refractor Vs. Reflector Telescopes
Want to know why a the Hubble is a refractor telescope? What difference it makes?
23 comments
87Stuff Made of Silver
I'm a bit of a magpie. I like shiny things, and I suspect I'm not alone -- the glint of silver has been hypnotizing people for millennia; more abundant and useful than gold, silver has been hoarded and admired by kings and paupers alike. As coin,...
31 comments
85Hubble Space Telescope - Changing Our View of the Universe
When the Hubble Space Telescope reached orbit in April, 1990, NASA and the scientific community were filled with anticipation and high hopes, but even they could not have imagined the extent to which Hubble would increase our understanding of the...
0 comments
83Astronomy at Blue Canyon Star Parties
This article provides general information about the Sacramento Valley Astronomical Society, particularly regarding its monthly star parties. The story also offers a short story about a UFO sighting at one of those star parties during the summer of 2001.
6 comments
87Birdwatchers vs. Twitchers
Most people think that birdwatchers and twitchers are one and the same. But I can assure you that they are very different, both in terms of which birds they choose to watch, and how far they are prepared to go, in order to do it.
28 comments
86Why do we care about the solar system and space explorations?
Humans has always sought understand the Universe, who we are and were we come, or where we are going? We need to continue space and solar planet explorations because it is an investment for our present and our future. Studies in cosmology, astrophysics and other disciplines need to be funded.
6 comments
84How to spot satellites
One of the more pleasurable things I can remember about my childhood was spotting satellites with my father. We lived out in the sticks near Branchland, West Virginia at the time, so light pollution wasn't a problem. Back then, small towns (Think...
12 comments
85Galileo and the Telescope: How 400 Years Ago Galileo Changed the World
Galileo, an Italian professor of mathematics, did not invent the telescope. No one knows for sure who the first inventor was. But this new device spread quickly across Europe. At first it was more of a parlor toy and it was used by the military. But...
8 comments
83Types Of Cranes
Crane is a huge tower to which trolleys and pulleys are attached and is used to lift extremely heavy objects. Cranes are either attached to movable vehicles or are fixed to the ground and are operated with a button or a handle. Cranes are found...
5 comments
