How long after Sputnik was Explorer 1 launched? How long is the space shuttle Endeavor? Which Apollo spacecraft was used in the Apollo-Soyuz? How much air was in the Apollo spacecraft? How much did the Apollo spacecraft cost? What was Apollo spacecraft made of? How long did the first ...
Planetary/lunar imaging is relatively cheap. DSO imaging - not so much. The way to do DSO imaging inexpensively is to reduce the focal length (most important), and increase the optical speed (lower F number, important, but not as much). The setup below illustrates. Edited by bobzeq25, 1...
For me it was a small book called Observers Book of Astronomy, by Patrick Moore. It cost me £1.99 in 1980. The following weekend I bought Guide To The Moon, also by Patric Moore. On getting home I sat in my dad's chair and read Guide To The Moon from front to back in six an...
Congratulations... Christmas came early... you are so much getting in Elonta's nice book this time with new purchase... Thanks! Well I hope it wasn't my...
Duh. Too much to say for a bullet, so here’s a Blue Box: Asteroid Impacts Are Unpleasant Blue Box There are asteroids and comets1 roaming around all parts of the Solar System, ranging from the size of a pebble to the size of a dwarf planet, but most of them are in three places...
Step 9. Can we afford the cost of CO2 mitigation? Step 8. Will any realistic measures avert the danger? Step 7. Will warmer worldwide weather be dangerous? Step 6. Will temperature feedbacks amplify that warming? Step 5. Will greenhouse-gas emissions cause much warming?
the moon. But after the Soviet Union leapfrogged the United States with a string of spectacular space “firsts” including the launch ofSputnik 1,the first artificial satellite, on October 4, 1957; and the first manned orbital flight of cosmonaut Yuri Gagarin aboardVostok 1on April 12, 1961...
All the decarbonization we can do isn’t going to change the climate much. 6 There is no such thing as “carbon pollution.” Carbon dioxide is coming out of your nose right now; it is not a poisonous gas. CO2 concentrations in previous eras have been many times h...
Thanks for the pictures Andy. Your excellent pictures with these fast beasts have played a big role in my decision to purchase this scope. Glad to see it's at least possible to use a focuser that doesn't cost almost as much as the OTA itself, at least I am willing to give it a tr...
site. Jupiter barely looks like a white, bright disk on it, but it was kind of enough for me. I recently graduated and started earning my own money, and literally the first thing I did was order a much bigger scope. Still waiting for it to arrive in a few weeks. Yeah, I'm ...