Troodos Star Observatory вђ World Buildings Directory Architecture They may contain the mass of one or two suns but are often just 20 to 40 km in diameter. white dwarf stars are a bit bigger often similar in size to our planet earth . the largest supergiant stars can be more than 1500 times larger than our sun. this makes them over 2,000 million km across. however, supergiants actually don't contain. Credit: hst nasa. stars are massive, glowing balls of extremely hot gas (called plasma) in space. the sun is our closest star. although stars look small in the sky, they are actually massive objects, millions of times larger than the earth. they look small because they are very far away. after the sun, the nearest star is proxima centauri.
About Us Life cycle of a star. all stars form in nebulae, which are huge clouds of gas and dust. though they shine for many thousands, and even millions of years, stars do not last forever. the changes that occur in a star over time and the final stage of its life depend on a star's size . nuclear reactions at the centre (or core) of a star provides. Our closest star, the sun, shines with a yellow light. the sun is classed as 'g' star, with a temperature of about 5,800 °k. (when talking about the temperature of stars, we usually use the unit 'kelvin' 5,800 °k is about 5,500 °c.) the hotter stars are usually much less common than the cooler, redder ones. Wein's law shows the relationship between an object's temperature and the wavelength at which it emits the most light. we can use the λmax of a star and wein's law to work out the star's surface temperature. wein's law states that temperature (t) = b λmax. where b = wien's displacement constant, equal to 2.897771955 ×10 −3 m k. Their colour tells us the temperature of the star. some stars shine with a red ish colour. this means they are quite cool for stars only 3000 °c or less. other stars shine with blue ish glow. this means they are much hotter over 30,000 °c! the sun is shines with a yellow ish colour and is about 6,000 °c. this makes the sun a relatively.
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