Dumbbell Nebula by homcavobservatory Via Flickr: The Dumbbell Nebula (Messier 27) - is a ‘planetary nebula’ (i.e. a star in the process of dying) lying approximately 1350 light-years from Earth and spanning about 3 light-years in diameter, One of the larger and brighter planetary nebulae, it can be found in the constellation of Vulpecula. The first planetary nebula ever discovered (by Charles Messier in 1764), the central star is the largest white dwarf known and among those with the highest surface temperature (i.e. 85,000 K (as opposd to 5,778 K for our Sun)).
Image Details: Taken by Jay Edwards at the HomCav Observatory using a (1970) 8-inch, f/7 Criterion reflector, connected to a Celestron coma corrector and Canon 700D DSLR; riding on a Losmandy G-11 dual-axis drive mount autoguided using an Orion Starshoot thru an 80 MM Celestron short-tube refractor, controlled by PhD 2.0. This image is our first test using this autoguided system and has been resized down here to HD resolution and the bit depth lowered from 16 to 8 bits per channel to reduce the file size.
The Infantry Automatic Rifle (IAR) was one of Colt’s entries into the program of the same name to replace the M249 SAW’s in the USMC’s inventory. Colt’s rifle lost the bid to the H&K 416 which would later be designated the M27 IAR. The massive bulk in the handguard is actually a heat sink designed to help cool the rifle during full-auto use. The Colt IAR is in use with the Mexican military and a few of the uppers were available on the U.S market when Colt filed for bankruptcy and sold off inventory. Note the Armatac 150 round drum. (GRH)
A lightweight weapon firing 5.56 NATO currently in the process of being procured by the US Marine Corps and intended to enhance an automatic rifleman’s maneuverability. Based on the Heckler & Koch HK416, the IAR is classified by the Corps as a Squad Automatic Weapon and, according to Marine Brass, will be replacing a portion of the M249 light machine guns.
The Dumbbell Nebula aka M27 is a planetary nebula, the type of nebula our Sun will produce when nuclear fusion stops in its core. M27 is one of the brightest planetary nebulae in the sky, and can be seen toward the constellation of the Fox (Vulpecula) with binoculars. It takes light about 1,000 years to reach us from M27, shown above in colors emitted by hydrogen and oxygen.
The first hint of what will become of our Sun was discovered inadvertently in 1764. At that time, Charles Messier was compiling a list of diffuse objects not to be confused with comets. The 27th object on Messier’s list, now known as M27 or the Dumbbell Nebula, is a planetary nebula, the type of nebula our Sun will produce when nuclear fusion stops in its core. M27 is one of the brightest planetary nebulae on the sky, and can be seen toward the constellation of the Fox (Vulpecula) with binoculars. It takes light about 1000 years to reach us from M27, shown above in colors emitted by hydrogen and oxygen.
Understanding the physics and significance of M27 was well beyond 18th century science. Even today, many things remain mysterious about bipolar planetary nebula like M27, including the physical mechanism that expels a low-mass star’s gaseous outer-envelope, leaving an X-ray hot white dwarf.