73 questions and answers in this section

Natural Sciences » Astronomy

Explain why some species of stars have extremely powerful magnetic fields?

Explain why some species of stars have extremely powerful magnetic fields?

When a star spins hyper-fast on itself, the plasma it contains swirls intensely, somewhat like water in a washing machine on high spin. This movement...

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Explain why some planets do not have an atmosphere?

Explain why some planets do not have an atmosphere?

The gravity of a planet is basically its ability to hold onto everything that passes nearby. When the planet is too small, its gravitational force...

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Explain why ancient civilizations often used calendars based on the moon?

Explain why ancient civilizations often used calendars based on the moon?

Ancient civilizations observed the phases of the Moon directly without any special instruments. They simply had to look up and follow its cycle of about...

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Explain why some civilizations worshipped the Sun as a god?

Explain why some civilizations worshipped the Sun as a god?

The Sun has always been perceived as the main source of life by ancient civilizations: simply because without it, there is no heat, no light, and therefore...

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Explain why some stars are red giants?

Explain why some stars are "red giants"?

Stars are born from massive clouds of gas and dust called nebulae. Under the influence of gravity, these clouds contract, heat up, and trigger nuclear...

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Explain why ancient pyramids are aligned with certain stars?

Explain why ancient pyramids are aligned with certain stars?

The ancient builders had a perfect understanding of the celestial cycles, carefully observing the stars to track their regular movements and predict significant phenomena. The...

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Explain why do some stars emit X-rays?

Explain why do some stars emit X-rays?

Stars emit X-rays when their heated material reaches very high temperatures, typically several million degrees. At these temperatures, electrons are stripped from atoms: the gas...

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Explain why are some stars called white dwarfs?

Explain why are some stars called white dwarfs?

Historically, the term white dwarf dates back to the early 20th century, when astronomers discovered very small but very bright stars of white color. They...

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Explain why do stars twinkle more in winter than in summer?

Explain why do stars twinkle more in winter than in summer?

In winter, the marked contrast between the very cold air near the ground and the warmer layers of air higher up enhances atmospheric turbulence. The...

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Explain why does the city of Tromsø (in Norway) experience months without sunlight?

Explain why does the city of Tromsø (in Norway) experience months without sunlight?

Tromsø is located in the north of Norway, nearly 350 kilometers north of the Arctic Circle. This very northern location makes it one of the...

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