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Dwarf Galaxies were leftover building blocks of the universe.
Astronomers used to believe that dwarf irregular Galaxies were leftover building blocks from the beginning of the universe which somehow avoided getting gobbled up by larger galaxies. New observations using the Subaru telescope of dwarf Galaxy Leo A has challenged this theory, however, as it's clearly been through a lot in its history. Astronomers found that size and structure of Leo A is significantly more complex than previously observed, and it shares many aspects of larger, more complex Galaxies like our own Milky Way - it probably went through similar mergings and galactic collisions.
The annual Perseid meteor shower has already started, but it's going to peak on the night of August 11, with observers in dark locations seeing upwards of 60 meteors an hour. This year could be special, though, since the Earth is expected to pass through a brand new filament of material left over from Comet Swift-Tuttle when it flew past in 1862. This year's Perseids could turn into a full fledged meteor storm, but the only way to know for sure is to get out and watch. The best time will be after 11 pm, in the darkest skies you can find.
NASA and JAXA have decided to extend the operations of the Tropical Rainfall Measuring Mission (TRMM) until the end of 2004 so it can provide data during the Autumn storm season for the U.S. and Asia. Officials had originally planned to have the spacecraft cease observations in July, and then perform a safe de-orbit maneuver about a year later. TRMM measures rainfall levels over the global tropics, allowing scientists to study the transfer of water and energy from the oceans into the atmosphere and back again. Its radar can see through clouds providing detailed images of the insides of hurricanes and storms.
Cassini took this image of Saturn - its new home - as it traveled away from the Ringed planet after its arrival in orbit. Separate images were taken with its red, blue and green filters on July 17, and then merged to create a natural colour view. Cassini was 5.8 million km (3.6 million miles) away at the time.
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