Though its wingspan covers over 3 light-years, NGC 6302 is no exception. With an estimated surface temperature of about 250,000 degrees C, the dying central star of this particular planetary nebula has become exceptionally hot, shining brightly in ultraviolet light but hidden from direct view by a dense torus of dust.
This sharp and colorful close-up of the dying star’s nebula was recorded in 2009 by the Hubble Space Telescope’s Wide Field Camera 3, installed during the final shuttle servicing mission. Cutting across a bright cavity of ionized gas, the dust torus surrounding the central star is near the center of this view, almost edge-on to the line-of-sight. Molecular hydrogen has been detected in the hot star’s dusty cosmic shroud. NGC 6302 lies about 4,000 light-years away in the arachnologically correct constellation of the Scorpion (Scorpius).
A beached whale is a very big (no pun intended) safety hazard. There are pretty much no effective and safe ways to dispose of it, and if it is left to rot there is a risk of a hefty explosion. As a whale decomposes, methane, hydrogen sulfide, and ammonia gas build up inside the carcass, the internal organs liquefy, and the whale begins to blow up like a balloon. The skin and blubber layers also decompose and become thinner and thinner. If the whale is left to decompose, one of two things will happen: either the gas will find a small leak in the skin and will gradually deflate, or the skin will suddenly rupture, causing a violent explosion.
April 16 2015 - Clashes erupted as over 150,000 students marched through Alameda in Santiago, Thursday, in the first nationwide rally organised by the Confederation of Chilean Students (CONFECH) in support of education reform and against recent governmental corruption scandals. [video]
It has been suspected for some time that man-made causes were behind a significant uptick of earthquakes in Oklahoma and other areas that don’t normally experience seismic activity. Many have accused hydraulic fracturing (fracking) as being the source. In the last week, both the U.S. Geological Survey (USGS) and the Oklahoma Geological Survey (OGS) have given their verdict on the issue: it’s not fracking causing the quakes - it’s the wastewater disposal wells where fracking byproducts are injected. A group of scientists studying an increase of earthquakes in Texas reached the same conclusion, although they also cited the removal of brine from the ground during fracking as an additional cause, saying that the fluid removal changes underground pressure.