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( Star) A star is a massive, luminous ball of plasma. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth. Other stars are visible in the night sky, when they are not outshone by the Sun. For most of its life, a star shines due to thermonuclear fusion in its core releasing energy that traverses the star's interior and then radiates into outer space. Almost all elements heavier than hydrogen and helium were created by fusion processes in stars.

A star begins as a collapsing cloud of material composed primarily of hydrogen, along with helium and trace amounts of heavier elements. Once the stellar core is sufficiently dense, some of the hydrogen is steadily converted into helium through the process of nuclear fusion.^[1] The remainder of the star's interior carries energy away from the core through a combination of radiative and convective processes. The star's internal pressure prevents it from collapsing further under its own gravity. Once the hydrogen fuel at the core is exhausted, those stars having at least 0.4 times the mass of the Sun^[2] expand to become a red giant, in some cases fusing heavier elements at the core or in shells around the core. The star then evolves into a degenerate form, recycling a portion of the matter into the interstellar environment, where it will form a new generation of stars with a higher proportion of heavy elements.^[3]

Historically, stars have been important to civilizations throughout the world. They have been used in religious practices and for celestial navigation and orientation. Many ancient astronomers believed that stars were permanently affixed to a heavenly sphere, and that they were immutable. By convention, astronomers grouped stars into constellations and used them to track the motions of the planets and the inferred position of the Sun.^[5] The motion of the Sun against the background stars (and the horizon) was used to create calendars, which could be used to regulate agricultural practices.^[6] The Gregorian calendar, currently used nearly everywhere in the world, is a solar calendar based on the angle of the Earth's rotational axis relative to the nearest star, the Sun.

The oldest accurately-dated star chart appeared in Ancient Egypt in 1,534 BCE.^[7] Islamic astronomers gave to many stars Arabic names which are still used today, and they invented numerous astronomical instruments which could compute the positions of the stars. In the 11th century, Abu Rayhan al-Biruni described the Milky Way galaxy as multitude of fragments having the properties of nebulous stars, and also gave the latitudes of various stars during a lunar eclipse in 1019.^[8]

Star Subcategories Star Articles Diet and Health Starts in The Kitchen by Patrick Havey One of the first places to look when it comes to a healthy diet is the kitchen. Almost 100 if necessary. Moving down to the fruit and vegetable bins, these most often are not filled with a variety of those, or they contain other items like beer, c... Indulge Yourself with the Skincare Cosmetics of the Stars by Christy Smith The secret is out of the bag. Ladies, skincare cosmetics that were once reserved for fashion models and women of lavish means are finally available to you. Don’t think for a second that these cosmetics are outside your price range. On the contrary, t... Easy Weight Loss Tips - Lose Weight - 10 Tips You Should Start Using by Sue Baker Do you ever find when you go on a diet that you feel hungry all the time? Somehow you feel deprived. Well, here are some of my favourite tips to help you lose weight without following a diet or having to buy special foods. Best of all I'm not going t... Shocking Truths You Should Know Before You Start Any Weight Loss Plan by Francis Adam Following a vigorous and usual credence loss plan is dangerous if your aim is to lose credence and keep those pounds off. Most specialists would direct you to do two obsessions. 1) Starve yourself or not consume 2) knock at the fitne... How to Get Started as an Affiliate Marketer by Caroline Hornsby If you are thinking of starting your own online home based business with affiliate marketing, you are definitely on the right track for making money from home with the Internet. There are many companie... How To Start Jogging - Beginner Running Tips by Jim Jones A lot of people ask me "How do i start jogging?" and my usual quirky reply is simple "Get up and move!". But really there are some thing you have to pay attention when you are starting out on a running routine! When you have any kind of medic... Start Losing Weight by Michael Marquette It seems like every other day there is a new fad diet or pill that promises to good to be true results and many times they are just that, too good to be true. The best diet to lose fat is not only one that concentrates on creating healthy eating hab... Yoga for Women: Before you Start by Nicholas Tan The following yoga poses can be done anytime, anywhere, or as part of another workout. Always warm up for a few minutes with some walking, marching or similar activity until your body and muscles feel loose and warm. Breathe deeply and fully... Yoga: Yoga for Modern City Life - Most Urbanites Start with a Class by Nicholas Tan The best place to start is with a class, where a teacher can show you how to adapt poses using props and help you learn proper technique for the postures. The good news is that yoga classes have never been more widely available. You'll find t... Read before you start your diet by James Pswarai A diet may be a fad diet or a good diet. People often begin a fad diet for quick weight loss. They do not realize that quick weight loss is not the resolution for their weight problem. They may lose weight initially but that may not be permanent. ...