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1, The size of the nebula at this stage is inversely proportional to its mass.

2, Explosions flared like novas inside a dust nebula.

3, The nebula is nearly 50 light-years in diameter, and may owe much of its illumination to Deneb.

4, As before, the star condenses out of a nebula, heats up, and begins to shine by the hydrogen-into-helium process.

5, My collected works rendered the Horsehead Nebula, goofy space cruisers, robots, and Saturn.

6, A nearby nebula, orange and pink, was the lurid gaseous residue of an explosion.

7, And here you see the Crab Nebula.

8, Boomerang Nebula - the coolest place in the Universe?

9, The vast Cat's Paw Nebula in Scorpius.

10, The result is called, somewhat misleadingly, a planetary nebula.

11, The remnants today are seen as Crab Nebula.

12, In 1787, astronomer William Herschel discovered the Eskimo Nebula.

13, Extragalactic nebula is invisible to the naked eye.

14, The Trifid Nebula is about 40 light-years across.

15, Its remnants form the Crab Nebula.

16, The beautiful hourglass-shaped nebula Sharpless 2-106 shines with brilliant colors in this new image from the Gemini North telescope.

17, NGC 2818 is a beautiful planetary nebula,(http://sentencedict.com/nebula.html) the gaseous shroud of a dying sun - like star.

18, Tenth, we see a fragment of the Trifid Nebula, a stellar cradle to 9000 light - years .

19, Planetary nebula Mz3 is being cast off by a star similar to our Sun that is, surely, round.

20, This composite image of the Crab Nebula combines a Chandra X-ray image in light blue with the Spitzer Space Telescope infrared image in red and Hubble Space Telescope’s optical image.

21, Astrophysicists have long thought of the Crab Nebula as a steady "standard candle" in X-ray wavelengths.

22, The Crab Nebula is the brightest source of reasonably steady high-energy radiation (X-rays and gamma rays) in the sky.

23, These red giants were probably close neighbours of the infant sun and the ejected matter fell into the solar nebula.

24, According to present-day ideas, a star begins its career by condensing out of a cloud of dust and gas known as a nebula.

25, The most celebrated of them is M57, the Ring Nebula in Lyra.

26, By sheer coincidence Kappa Crucis lies at the edge of the dark nebula known as the Coal Sack.

27, Then, for a relative blink of about 1, 000 years or less, the star becomes a planetary nebula.

28, Many objections can be raised to this picture of planetary nebula formation.

29, The white dwarf star at the center of this planetary nebula may be accompanied by a second-generation world, formed from the debris of the dying star's original planets.

30, Made with data from the Nordic Optical Telescope in the Canary Islands, the composite picture shows extended emission from the nebula.