![]() The Trifid Nebula (M20) in Sagittarius is a good example of a reflection nebula.ĭark Nebula - A dark nebula is a cloud of dust that blocks the light from objects behind it. Blue light is scattered more efficiently. They usually tend to be blue in color because of the way that the light is scattered. Reflection nebulae are frequently the sites of star formation. It is a cloud of dust and gas that reflects the light energy from a nearby star or group of stars. Reflection Nebula - A reflection nebula differs from an emission nebula in does not emit radiation of its own. A fine example of an emission nebula is the Orion Nebula (M42). Additional colors, such as blue and green, can be produced by the atoms of other elements, but hydrogen is almost always the most abundant. Emission nebulae tend to be red in color because of the abundance of hydrogen. The process is similar to that of a neon light. As these atoms fall back to lower energy states, they emit radiation. Within this type of nebula, a star energizes the atoms in the cloud with ultraviolet radiation. They are also known as diffuse nebulae.Įmission Nebula - An emission nebula is a cloud of high temperature gas. ![]() Emission and reflection nebulae tend to be fuzzy in appearance and lack any noticeable shape or structure. These are emission nebulae, reflection nebulae, dark nebulae, planetary nebulae, and supernova remnants. Nebulae have been divided into five major categories. Many of them are dozens or even hundreds of light-years across. In fact, they are among the largest objects in the galaxy. These clouds of matter are also quite large. Most nebulae are composed of about 90% hydrogen, 10% helium, and 0.1% heavy elements such as carbon, nitrogen, magnesium, potassium, calcium, iron. These colors are the result of different elements within the nebula. Stars inside these clouds of gas cause them to glow with beautiful reds, blues, and greens. They are also among the most beautiful objects in the universe, glowing with rich colors and swirls of light. They contain the elements from which stars and solar systems are built. Nebulae are the basic building blocks of the universe. Indeed, a nebula is a cosmic cloud of gas and dust floating in space. Measurements show the nebula has a temperature of only one degree Kelvin above absolute zero (nearly -460 degrees Fahrenheit).The word " nebula" is derived from the Latin word for "clouds". The Boomerang Nebula is about 5,000 light-years from Earth in the direction of the Southern constellation Centaurus. ![]() Hubble’s sharp view is able to resolve patterns and ripples in the nebula very close to the central star that are not visible from the ground. The nebula’s name is derived from its symmetric structure as seen from ground-based telescopes. Over the last 1,500 years, nearly one and a half times the mass of our Sun has been lost by the central star of the Boomerang Nebula in an ejection process known as a bipolar outflow. This reflecting cloud of dust and gas has two nearly symmetric lobes (or cones) of matter that are being ejected from a central star. The Hubble Space Telescope has “caught” the Boomerang Nebula in these new images taken with the Advanced Camera for Surveys. The Hubble Space Telescope has "caught" the Boomerang Nebula in these new images taken with the Advanced Camera for Surveys.
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