NASA / ESA’s Hubble Space Telescope observes a collection of interstellar gas and dust in nebula RCW 7, which is located 5,300 light-years from Earth in the constellation Puppis. Due to the massive protostars forming here that give off strongly ionizing radiation and fierce stellar winds, RCW 7 is known as an H II region.
H II regions are basically filled with hydrogen ions, and the ultraviolet radiation from the massive protostars excites the hydrogen, causing it to emit light and giving RCW 7 its soft pinkish glow. In this image, we see the clouds form a flat blue background towards the bottom, becoming more smoky towards the top. They are illuminated on one side by stars in the nebula, while a thick arc of gas and dust reaches around from the top, where it is brightly lit by many stars.
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The creation of an H II region marks the beginning of the end for a molecular cloud. Over only a few million years, the radiation and winds from the massive stars gradually disperse the gas — even more so as the most massive stars come to the end of their lives in supernova explosions,” said the ESA.
