Question 1

What are the main components of the universe?

Accepted Answer

The main components of the universe include galaxies, stars, planets, moons, asteroids, comets, dark matter, and dark energy. Additionally, there is interstellar gas and dust, as well as cosmic microwave background radiation, which is the remnant of the Big Bang.

Question 2

What is the difference between a star and a planet?

Accepted Answer

A star is a massive, luminous ball of plasma held together by gravity, which generates energy through nuclear fusion in its core. Stars produce their own light and heat. Planets, on the other hand, are celestial bodies that orbit a star and do not produce their own light. They are usually made up of solid materials or gases and are considerably smaller than stars.

Question 3

What is a light-year?

Accepted Answer

A light-year is a unit of distance used in astronomy to express the vast distances between celestial objects. It represents the distance that light travels in one year in a vacuum, which is approximately 5.88 trillion miles or 9.46 trillion kilometers.

Question 4

What causes the apparent movement of constellations in the night sky?

Accepted Answer

The apparent movement of constellations in the night sky is caused by the rotation of Earth on its axis. As Earth rotates, the position of celestial objects, including constellations, appears to change in our sky. The daily movement of stars and constellations from east to west is primarily due to Earth's rotation.

Question 5

What are the differences between a meteor, meteoroid, and meteorite?

Accepted Answer

A meteoroid is a small piece of debris, usually from an asteroid or comet, that travels through space. Upon entering Earth's atmosphere, a meteoroid becomes a meteor, which is a bright streak of light visible in the sky as the object burns upon entering the atmosphere. If a meteor survives its passage through the atmosphere and strikes the Earth's surface, it is then called a meteorite.

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