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31, Such tumultuous, often visually spectacular, interstellar regions surrounding youthful stars are known as gaseous nebulae.

32, Astronomers in Japan say one of the best-known nebulae—the Trifid, in the constellation Sagittarius—owes its splendor to a smashup between two clouds of gas and dust.

33, The name originates from the 18th century, when telescopes weren't powerful enough to distinguish nebulae from gas giant planets.

34, It shows Orion's belt stars and well-known nebulae along with many 2.5 degree long geostationary satellite trails.

35, These gases are ionised by ultraviolet light from the remaining core and glow, resulting in nebulae that take on a variety of shapes and sizes.

36, The universe is an unimaginably vast space filled with planets, stars, systems, nebulae, gas, dust -- and it's impossible for us to ever explore it all.

37, Explanation : The Horsehead Nebula is one of the most famous nebulae on the sky.

38, The Galactic Dust in Corona Australis: Two blue - reflection nebulae.

39, Hanging from his belt, the stars and nebulae of the Hunter's sword are visible lower and to the right. Yellow-orange Betelgeuse is the brightest star on the image left.

40, Some astronomers thought nebulae were part of our Milky Way Galaxy.

41, Where the otherwise obscuring dust clouds lie close to the hot, young stars they also reflect starlight, forming blue reflection nebulae.

42, The fuzzy star or fuzz balls are the Lagoon and Trifid nebulae or Messier Objects 8 and 20.

43, Planetary nebulae fade away gradually over tens of thousands of years.

44, Some nebulae are made up of both reflection and emission components such as the Trifid Nebula.