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A Chameleon Sky
 The sands of time are running out for the central star of this the Hourglass Nebula. With its nuclear fuel exhausted, this brief, spectacular, closing phase of a sun-like star's life occurs as its outer layers are ejected and its core becomes a cooling, fading white dwarf. In 1995, astronomers used the Hubble Space Telescope to make a series of images of planetary nebulae, including the one above. Here, delicate rings of colorful glowing gas (nitrogen-red, hydrogen-green, and oxygen-blue) outline the tenuous walls of the 'hourglass.' The unprecedented sharpness of Hubble's images revealed surprising details of the nebula ejection process and may resolve the outstanding mystery of the variety of complex shapes and symmetries of planetary nebulae. Image Credit: NASA, WFPC2, HST, R. Sahai and J. Trauger (JPL) Read More |
July went by pretty quickly. It was so much like June. The rain was the same. The nights a bit chillier, the days slightly warmer. Except for the last week of the month. The days have hit the 80’s (F). The mornings start of with a chorus of mockingbirds and woodpeckers, singing praises to the sun. [...] One quick thing to note … Crowhill is a location near Plymouth, which is used by a bird-counter for the NH Audubon society. So in a way, we are officially on the map What I will be posting here is what we have been seeing lately … both in birds and animals. Being this blog was [...] |
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