Since it’s the first thing someone considers buying a new telescope, Israeli astronomer Michael Vlasov illustrates which views can you expect to get through different telescopes.
On his page, he covers the Moon, planets, Sun, Deep sky objects, comets, double stars, light pollution, and shares a lot of other useful information.
Image copyright © DeepSkyWatch.com 2015
(Source: deepskywatch.com, via chiefcatmeanie)
NGC 3576 Nebula
The Movement of Barnard’s Star
The fourth closest known star to our Sun (following the Alpha Centauri stars), Barnard’s Star is famous for having the largest known proper motion of any star. Proper motion is the measure of the observed changes in a star’s position against the distant background stars and in 1916, E. E. Barnard measured this star’s proper motion to be 10.3 arcseconds per year. This corresponds to a speed of 90 km/s across our line of sight.
This movie by RickJ, posted in the CosmoQuest forums, shows the movement of Barnard’s Star over 9 years. Each frame represents one year between 2007 and 2015.
Image: The proper motion of Barnard’s Star over the last 9 years. (Credit: RickJ)
as mentioned in these previous posts, kilauea, a flat broad shield volcano, has erupted continuously from its pu’u o’o vent since 1983, growing the island by about 42 acres a year as its basaltic lava flow oozes at a speed of fifteen yards an hour into the ocean. photos by tom kuali.