Astronomy,Knowledge,Space

How massive can a normal star be? Estimates made from distance, brightness and standard solar models had given one star in the open cluster Pismis 24 over 200 times the mass of our Sun, making it one of the most massive stars known. This star is the brightest object located just above the gas front in the featured image. Close inspection of images taken with the Hubble Space Telescope, however, have shown that Pismis 24-1 derives its brilliant luminosity not from a single star but from three at least. Component stars would still remain near 100 solar masses, making them among the more massive stars currently on record. Toward the bottom of the image, stars are still forming in the associated emission neb

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ula NGC 6357. Appearing perhaps like a Gothic cathedral, energetic stars near the center appear to be breaking out and illuminating a spectacular cocoon.

Prof.Rajeev Tripathi

Conservation of Energy

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Watch “INTRODUCTION by Prof. Rajeev Tripathi” on YouTube

INTRODUCTION by Prof. Rajeev Tripathi: https://youtu.be/uvzL25ncRH8

Watch “INTRODUCTION by Prof. Rajeev Tripathi” on YouTube

INTRODUCTION by Prof. Rajeev Tripathi: http://youtu.be/uvzL25ncRH8

Astronomy

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What strange world is this? Earth. In the foreground of the featured image are the Pinnacles, unusual rock spires in Nambung National Park in Western Australia. Made of ancient sea shells (limestone), how these human-sized picturesque spires formed remains unknown. In the background, just past the end of the central Pinnacle, is a bright crescent Moon. The eerie glow around the Moon is mostly zodiacal light, sunlight reflected by dust grains orbiting between the planets in the Solar System. Arching across the top is the central band of our Milky Way Galaxy. Many famous stars and nebula are also visible in the background night sky. The featured 29-panel panorama was taken and composed last September after detailed planning that involved the Moon, the rock spires, and their corresponding shadows. Even so, the strong zodiacal light was a pleasant surprise.

Astronomy

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In this #cosmic snapshot, the spectacularly #symmetrical wings of #Hen 2-437 show up in a #magnificent icy blue hue. Hen 2-437 is a planetary nebula, one of around 3,000 such objects known to reside within the Milky Way.

Located within the faint northern #constellation of Vulpecula (The Fox), Hen 2-437 was first identified in 1946 by Rudolph Minkowski, who later also discovered the famous and equally #beautiful M2-9 (otherwise known as the Twin Jet Nebula). Hen 2-437 was added to a catalog of planetary nebula over two decades later by astronomer and NASA astronaut Karl Gordon Henize.

Planetary #nebulae such as Hen 2-437 form when an aging low-mass star — such as the sun — reaches the final stages of life. The star swells to become a red #giant, before casting off its #gaseous outer layers into space. The star itself then slowly shrinks to form a white dwarf, while the expelled gas is slowly compressed and pushed outwards by #stellar winds. As shown by its remarkably beautiful appearance, Hen 2-437 is a bipolar #nebula — the material ejected by the dying star has streamed out into #space to create the two #icy blue lobes pictured here.

Tutorial

https://plus.google.com/116952840782221197540/posts/cxGpTD2ub9D?_utm_source=1-2-2