The Sun is approximately 1.39 million kilometers (about 864,000 miles) in diameter. It is about 93 million miles (150 million kilometers) away from Earth, making it the center of our Solar System.
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Venus is hotter than Mercury due to its thick atmosphere, which is rich in carbon dioxide. This atmosphere traps heat through the greenhouse effect, causing surface temperatures to soar despite being farther from the Sun.
The Sun shines during the day because it is the primary source of light for Earth. The Moon shines at night by reflecting sunlight, which makes it visible when the Sun is not illuminating the sky.
Stars appear to twinkle due to atmospheric turbulence. As starlight passes through layers of Earth’s atmosphere, varying air densities cause refraction, leading to fluctuations in brightness and position, creating the twinkling effect known as “stellar scintillation.”
The Hubble Space Telescope is named after the American astronomer Edwin Hubble. It is used to observe distant galaxies, stars and other celestial phenomena, providing valuable data that has advanced our understanding of the universe.