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How do the luminosities and lifetime of stars depend on their mass?

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How do the luminosities and lifetime of stars depend on their mass?

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More massive stars must also in turn be more luminous (and make more energy) in order to support their weight. This is the mass-luminosity relationship.

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Stars make energy by burning Hydrogen and turning it into Helium. This causes nuclear fusion.

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Stars keep stability by having an equally balanced relationship between gas, temperature, and pressure.

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How do stars form in the interstellar medium?

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How do stars form in the interstellar medium?

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Not all clouds of interstellar medium become a star. Temperature, turbulent gas currents, and magnetic fields all have a part in creating the star.

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How do astronomers study the gas and dust between the stars, called the interstellar medium?

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How do astronomers study the gas and dust between the stars, called the interstellar medium?

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Some effects of interstellar medium are visible such as interstellar reddening.  Also, astronomers use the absorption spectrum.

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Bipolar Flow is matter in two opposite directions from a star.

Picture from: "Bipolar Outflow." Bipolar Outflow. N.p., n.d. Web. 12 Dec. 2016.

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A T- Tauri star is a young star surrounded by gas and dust contracting toward the main sequence.

Picture from: "What Is a T Tauri Star? | Space Facts – Astronomy, the Solar System & Outer Space | All About Space Magazine." Space Facts Astronomy the Solar System Outer Space All About Space Magazine. N.p., n.d. Web. 10 Dec. 2016.

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Herbig-Haro Objects are small nebulae associated with star information that varies irregularly in brightness.

Picture from: "Herbig-Haro Object HH 47, a Stellar Jet in Vela." Anne's Astronomy News. N.p., 02 Dec. 2012. Web. 12 Dec. 2016.

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Bok Globules are isolated and relatively small dark nebulae

Picture from: "Thackeray's Globules." Thackeray's Globules. N.p., n.d. Web. 12 Dec. 2016.

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A nebula is a cloud of gas and dust in space.
Ex: Orion's Belt

Picture from:

"Orion Nebula." Wikipedia. Wikimedia Foundation, n.d. Web. 10 Dec. 2016.