Why do stars emit light? Detailed answer

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Why do stars emit light? Detailed answer

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Why do stars emit light?

Stars are huge balls of gas that emit their own light, unlike the planets and their satellites, which glow by reflected starlight. For example, moonlight is nothing but sunlight reflected by the moon. Another difference is that the stars seem to twinkle to us, while the light of the planets is even and unblinking. The twinkling of stars is caused by the presence of various substances in the earth's atmosphere.

Our Sun is also a star, although not too big or bright. Compared to others, it occupies an intermediate position in these parameters. Millions of stars are much smaller than our Sun, while others are much larger. Among them there are those that, being in the place of the Sun, would include the orbits of not only the Earth and Mars, but even Jupiter! However, they still appear to us as small dots due to their very great distance.

Since the time of ancient Greek astronomers, stars have been divided into groups according to their magnitude. The concept of "magnitude" here does not mean the true size of the stars, but their brightness. In addition, stars differ in their spectra, or, in other words, in the wavelengths of their radiations. By studying the spectrum of a star, astronomers learn a lot about its features, temperature, and even chemical composition.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Why was King Richard I of England nicknamed the Lionheart?

The English king Richard I the Lionheart (1157-1199) was a typical medieval knight-adventurer. All his life he waged incessant wars, alien to the interests of England and costing her huge sums of money.

Participating in the third crusade (1189-1192), he continued to fight tirelessly even when everyone had already lost hope of recapturing Jerusalem from the Muslims. He was remembered "like a hedgehog because of the arrows that pierced his shell." During this campaign, Richard captured the island of Cyprus and the fortress of Acre (in Palestine). On the way back, he was captured by the Austrian Duke Leopold V, who handed him over to Emperor Henry VI, and was released only in 1194 for a huge ransom.

From 1194, Richard waged war with the French king Philip II Augustus, who sought to retake the lands owned by the Plantagenets in France.

Richard died from an accidental arrow during the siege of Chalus Castle in Aquitaine (France). About this fatal shot from a crossbow, one of his contemporaries said: "The ant killed the lion."

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Blue SN550 NVMe SSDs 24.11.2019

Western Digital has announced the Blue SN550 NVMe SSD, which can be installed in desktop and laptop computers.

The devices are made in M.2 2280 format: dimensions are 22 x 80 mm. Western Digital/SanDisk 96D TLC 3-layer flash memory microchips and Western Digital's proprietary controller are used.

The drives use the NVMe protocol and PCIe 3.0 x4 interface. The novelty is claimed to deliver four times the speed of the best Western Digital SATA solid-state solutions.

The WD Blue SN550 NVMe SSD family includes three models - 250 GB, 500 GB and 1 TB. Their read/write speeds and IOPS (input/output operations per second) are shown below:

"This powerful internal drive delivers high speeds so you can work, create, play or process large amounts of data more productively and faster," says Western Digital.

The devices come with a five-year warranty. The 250 GB, 500 GB, and 1 TB versions are priced at $55, $65, and $100.

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