Maxima is a free and open source software system for manipulation of symbolic and numeric expressions, high-precision numeric computations, and plotting in two and three dimensions. Maxima is a descendant of Macsyma, the computer algebra system developed in the 1960s at MIT that inspired commercial systems, such as Maple and Mathematica. Maxima was maintained . . . → Read More: Introduction to Maxima
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Planet Four is a cool, citizen science project in the Zooniverse, where ordinary people can help scientists identify and measure features on the surface of Mars. Image: NASA/JPL/University of Arizona Currently, the Planet Four project scientists are asking for help finding and marking “fans” and “blotches” on the Martian surface. It is believed that these . . . → Read More: Planet Four The young, crescent Moon was the “star” of this twilight … Crescent Moon at Twilight (c) TealComp.com 20130313 This work is shared under a Creative Commons Attribution-ShareAlike 3.0 Unported License. . . . → Read More: Crescent Moon steals the show Comet C/2011 L4 (Pan-STARRS) is currently (mid-March 2013) low in the western sky at twilight for northern hemisphere skygazers. Comet C/2011 L4 (PANSTARRS) will be visible to Northern hemisphere observers near the cresent moon on March 12th.Source: NASA The comet was discovered in June 2011 by astronomers using the Panoramic Survey Telescope and Rapid Response . . . → Read More: Catch a glimpse of Comet Pan-STARRS SpaceX checks off another success for its vertical takeoff and vertical landing (VTVL) vehicle, the Grasshopper. This is a demonstration of technology that enables a rocket to land intact, rather than burning up in the atmosphere on re-entry. On 07 March 2013, SpaceX‘s Grasshopper succeeded in leaping vertically 80.1 meters (about 24 stories), hovering for . . . → Read More: Well done, Grasshopper On 09 January 2013, asteroid 99942 Apophis swung by Earth with a closest pass of about 14.45 million kilometers. This is about 37 times farther than the average distance of the Moon from Earth. However, on 13 April 2029, Apophis will come within about 30,000 kilometers of Earth. This is closer than our geosynchronous communications . . . → Read More: Asteroid Apophis Carl Sagan “We’ve arranged a global civilization in which most crucial elements profoundly depend on science and technology. We have also arranged things so that almost no one understands science and technology. This is a prescription for disaster. We might get away with it for a while, but sooner or later this combustible . . . → Read More: Quote: Carl Sagan M13Source: ESA/Hubble & NASA Globular clusters are dense, spherical collections of stars that orbit like satellites about the cores of galaxies. Our own galaxy, the Milky Way, has over 150 known globular clusters. The Andromeda Galaxy (M31) has as many as 500 globulars. The supermassive, elliptical galaxy, M87, may have over 12,000 . . . → Read More: Globular Clusters Neil deGrasse Tyson is featured in this Minute Physics video … (click to see more) This image shows a stereographic projection of a mosaic centered on Mercury’s north pole. This mosaic is made up of MDIS (Mercury Dual-Imaging System) images acquired during its monochrome, color, monochrome stereo, high-incidence, albedo, three-color, and northern polar campaigns. The resolution of the image is approximately 1 kilometer per pixel. . . . → Read More: New mosaic of Mercury’s north pole |
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