<p>We&#8217;ll explain what stars are, how they shine, and why we can&#8217;t see them during the day.</p>
<div class="table-of-contents open"><!--noindex--><div class="table-of-contents__header"><span class="table-of-contents__hide js-table-of-contents-hide">Contents</span></div><ol class="table-of-contents__list js-table-of-contents-list">
<li class="level-1"><a href="#what-is-a-star">What Is a Star</a></li><li class="level-1"><a href="#how-stars-differ-from-planets">How Stars Differ from Planets</a></li><li class="level-1"><a href="#parameters-of-stars">Parameters of Stars</a></li><li class="level-1"><a href="#why-and-how-stars-shine">Why and How Stars Shine</a></li><li class="level-1"><a href="#why-stars-are-not-visible-during-the-day">Why Stars Are Not Visible During the Day</a></li></ol><!--/noindex--></div><h2 class="ds-markdown-paragraph" id="what-is-a-star"><span class="">What Is a Star</span></h2>
<p class="ds-markdown-paragraph"><span class="">A star is a massive and extremely hot celestial body made of gas that emits light. This light is produced through nuclear fusion in the star’s core, where hydrogen atoms are converted into helium. This process releases a tremendous amount of energy in the form of heat and light.</span></p>
<figure id="attachment_28076" aria-describedby="caption-attachment-28076" style="width: 750px" class="wp-caption aligncenter"><a href="https://mandry.club/wp-content/uploads/2026/07/How-Stars-Shine01.webp"><img class="wp-image-28076 size-medium" src="https://mandry.club/wp-content/uploads/2026/07/How-Stars-Shine01-750x428.webp" alt="Massive hot star radiating light in deep space" width="750" height="428" /></a><figcaption id="caption-attachment-28076" class="wp-caption-text">Stars are the most important elements of the Universe, as they generate heat and light for planets.</figcaption></figure>
<p class="ds-markdown-paragraph"><span class=""> The interiors of stars also forge heavy chemical elements, which later form solid objects, including planets.</span></p>
<p class="ds-markdown-paragraph"><span class="">It is important not to confuse stars with planets. Although stars and planets may look similar to the naked eye, there is a fundamental difference between them.</span></p>
<h2 class="ds-markdown-paragraph" id="how-stars-differ-from-planets"><span class="">How Stars Differ from Planets</span></h2>
<figure id="attachment_28077" aria-describedby="caption-attachment-28077" style="width: 750px" class="wp-caption aligncenter"><a href="https://mandry.club/wp-content/uploads/2026/07/Earth-like-Planet-_-Nebula-1.webp"><img class="wp-image-28077 size-medium" src="https://mandry.club/wp-content/uploads/2026/07/Earth-like-Planet-_-Nebula-1-750x428.webp" alt="Earth-like planet orbiting in a colorful nebula" width="750" height="428" /></a><figcaption id="caption-attachment-28077" class="wp-caption-text">Stars are composed exclusively of gas, while planets can contain rock in addition to gas.</figcaption></figure>
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<p class="ds-markdown-paragraph"><span class="">Stars are sources of light, while planets can only reflect it.</span></p>
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<p class="ds-markdown-paragraph"><span class="">Most stars are significantly larger in size and are always more massive than planets.</span></p>
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<p class="ds-markdown-paragraph"><span class="">The life of stars follows a specific life cycle, whereas planets can exist until something external destroys them.</span></p>
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<p class="ds-markdown-paragraph"><span class="">Stars consist only of gas, while planets, besides gas, can contain rocky material.</span></p>
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<p class="ds-markdown-paragraph"><span class="">Stars cannot be habitable.</span></p>
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<p class="ds-markdown-paragraph"><span class="">Stars have a higher surface temperature than planets.</span></p>
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<p class="ds-markdown-paragraph"><span class="">Stars orbit the center of a galaxy, while planets orbit stars.</span></p>
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<p class="ds-markdown-paragraph"><span class="">The atmospheres of stars are composed of hydrogen and helium, while planets may also contain nitrogen, oxygen, carbon dioxide, and other gases.</span></p>
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<h2 class="ds-markdown-paragraph" id="parameters-of-stars"><span class="">Parameters of Stars</span></h2>
<figure id="attachment_28078" aria-describedby="caption-attachment-28078" style="width: 750px" class="wp-caption aligncenter"><a href="https://mandry.club/wp-content/uploads/2026/07/Sun-and-Earth-in-Space.webp"><img class="wp-image-28078 size-medium" src="https://mandry.club/wp-content/uploads/2026/07/Sun-and-Earth-in-Space-750x428.webp" alt="Sun shining brightly over Earth in outer space" width="750" height="428" /></a><figcaption id="caption-attachment-28078" class="wp-caption-text">In the Solar System, which includes our planet, the Sun is the only star. Without its heat and energy, life on Earth would be impossible.</figcaption></figure>
<p class="ds-markdown-paragraph"><span class="">Stars look like tiny points of light in the sky, but this impression is only created because of their immense distance from our planet. The distance to the nearest star to us, excluding the Sun — Proxima Centauri — is estimated at 4.24 light-years. And the distance from Earth to the Sun is &#8220;only&#8221; about 8.3 light-minutes. By the way, do you know why distances in space are measured not in kilometers?</span></p>
<p class="ds-markdown-paragraph"><span class="">In the Solar System, where our planet is located, the Sun is the only star. Without its heat and energy, life on Earth would be impossible. The diameter of the Sun is about 1.4 million kilometers, and it is about 109 times larger than Earth. Compared to our planet, the Sun seems like a true giant, but among other stars, its size is not large at all. For example, the star Betelgeuse, one of the largest stars visible to the naked eye, is about 700 times larger in diameter than the Sun.</span></p>
<p class="ds-markdown-paragraph"><span class="">Throughout their existence, stars go through various stages. They are born in molecular clouds, then spend a long time on the so-called &#8220;main sequence.&#8221; At this stage, which occupies up to 90% of a star&#8217;s life cycle, the energy source is thermonuclear reactions in the core. At the end of their path, depending on their mass, stars can transform into different objects: some become white dwarfs, others — neutron stars or black holes.</span></p>
<blockquote class="info"><p>By physical parameters, stars differ in size — radius, mass, luminosity, and surface temperature.</p></blockquote>
<figure id="attachment_28083" aria-describedby="caption-attachment-28083" style="width: 750px" class="wp-caption aligncenter"><a href="https://mandry.club/wp-content/uploads/2026/07/How-Stars-Shine05.webp"><img class="wp-image-28083 size-medium" src="https://mandry.club/wp-content/uploads/2026/07/How-Stars-Shine05-750x500.webp" alt="Parameters of Stars" width="750" height="500" /></a><figcaption id="caption-attachment-28083" class="wp-caption-text">The mass of stars changes over the course of their life cycle. This occurs due to the fusion of hydrogen into helium, as well as through stellar winds or absorption by a companion star.</figcaption></figure>
<p class="ds-markdown-paragraph"><span class="">The latter is possible if stars orbit in close binary systems: gas can be pulled from one star to another by gravity.</span></p>
<p class="ds-markdown-paragraph"><span class="">Stars are divided into four types by size. For clarity, each category is compared to the mass of the Sun:</span></p>
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<p class="ds-markdown-paragraph"><span class="">Normal. Their mass is comparable to the mass of the Sun.</span></p>
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<p class="ds-markdown-paragraph"><span class="">Dwarfs. Their mass is hundreds of times less than the mass of the Sun.</span></p>
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<p class="ds-markdown-paragraph"><span class="">Giants. Tens of times larger than the mass of the Sun.</span></p>
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<p class="ds-markdown-paragraph"><span class="">Supergiants. The mass of such stars exceeds the mass of the Sun by hundreds of times.</span></p>
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<h2 class="ds-markdown-paragraph" id="why-and-how-stars-shine"><span class="">Why and How Stars Shine</span></h2>
<figure id="attachment_28084" aria-describedby="caption-attachment-28084" style="width: 750px" class="wp-caption aligncenter"><a href="https://mandry.club/wp-content/uploads/2026/07/How-Stars-Shine03.webp"><img class="wp-image-28084 size-medium" src="https://mandry.club/wp-content/uploads/2026/07/How-Stars-Shine03-750x500.webp" alt="Coldest red star glowing in dark outer space" width="750" height="500" /></a><figcaption id="caption-attachment-28084" class="wp-caption-text">The &#8220;coolest&#8221; stars are red. Their temperature is 2,500–3,800 °C.</figcaption></figure>
<p class="ds-markdown-paragraph"><span class="">Stars are the only cosmic objects that emit light.</span><br />
<span class="">Starlight is visible electromagnetic radiation emanating from stars other than the Sun. It can be observed from Earth&#8217;s surface at night.</span></p>
<p class="ds-markdown-paragraph"><span class="">All stars have different temperatures and colors. The temperature depends on the level of energy radiation and the size of the celestial body, i.e., the surface area emitting heat. And the color of a star is determined by its temperature. The hottest stars shine with blue or white light, while cooler ones are yellow, orange, or red.</span></p>
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<p class="ds-markdown-paragraph"><span class="">The &#8220;coolest&#8221; stars are red. Their temperature is 2,500–3,800 °C.</span></p>
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<p class="ds-markdown-paragraph"><span class="">The temperature of orange stars is 3,900–5,200 °C.</span></p>
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<p class="ds-markdown-paragraph"><span class="">Yellow stars heat up to 6,000 °C. The Sun is a yellow star, its temperature is 5,500 °C.</span></p>
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<p class="ds-markdown-paragraph"><span class="">The temperature of white stars ranges from 7,000 to 10,000 °C.</span></p>
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<p class="ds-markdown-paragraph"><span class="">Blue stars have the highest temperature — from 10,000 to 30,000 °C, and some stars heat up to 60,000 °C.</span></p>
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</ul>
<p class="ds-markdown-paragraph"><span class="">When observing stars, it may seem that they twinkle. In fact, this is an optical illusion, and stars do not twinkle. This effect arises because we look at the sky through the atmosphere, which consists of many layers. As starlight passes through these layers, it is refracted multiple times, which affects our perception. The distortion of starlight caused by the inhomogeneity of atmospheric layers is called scintillation.</span></p>
<h2 class="ds-markdown-paragraph" id="why-stars-are-not-visible-during-the-day"><span class="">Why Stars Are Not Visible During the Day</span></h2>
<p class="ds-markdown-paragraph"><span class="">Stars shine around the clock, but they can only be seen at night. During the day, this is impossible because of the Sun: due to its close distance to Earth, its light is so bright that it completely overwhelms the glow of other stars, making them invisible to humans.</span></p>
<p class="ds-markdown-paragraph"><span class="">Other factors also affect the visibility of stars:</span></p>
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<p class="ds-markdown-paragraph"><span class="">Stars are much harder to see in large populated areas because a large amount of artificial light is produced there, which interferes with observation. This phenomenon is called light pollution.</span></p>
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<p class="ds-markdown-paragraph"><span class="">High air humidity, dust, fog, clouds, and other atmospheric conditions also complicate visibility.</span></p>
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<p class="ds-markdown-paragraph"><span class="">Observation location. Some stars can only be seen from the Southern or only from the Northern Hemisphere.</span></p>
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<p class="ds-markdown-paragraph"><span class="">A full moon can interfere with stargazing, as during this period the bright moonlight outshines the light of fainter stars.</span></p>
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<p class="ds-markdown-paragraph"><span class="">The season also affects visibility due to our planet&#8217;s rotation around the Sun. August is considered one of the best months for observing stars and meteor showers. Every year, our planet crosses a stream of star dust ejected by the comet Swift-Tuttle. These particles burn up in the atmosphere, creating the effect of a meteor shower. This phenomenon is called the Perseid meteor shower.</span></p>
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