Stars and galaxies

Front

What is the main sequence in the life cycle of a star?

Back

The main sequence is the stage where stars spend most of their lives, fusing hydrogen into helium in their cores.

Front

Why are the inner planets of the solar system rocky?

Back

The inner planets are rocky because they are closer to the Sun, which causes higher temperatures that prevent gas and ice from forming.

Front

What galaxy is Earth located in?

Back

Earth is located in the Milky Way galaxy.

Front

What type of galaxy is characterized by spiral arms?

Back

A spiral galaxy is characterized by its spiral arms that extend outward from the center.

Front

What is the law of universal gravitation?

Back

Every object in the universe attracts every other object with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between them.

Front

What is a galaxy?

Back

A galaxy is a massive system of stars, stellar remnants, interstellar gas, dust, and dark matter, bound together by gravity.

Front

What are the three main types of galaxies?

Back

The three main types of galaxies are spiral, elliptical, and irregular.

Front

What is the Hubble Space Telescope?

Back

The Hubble Space Telescope is a space telescope that has provided valuable images and data about distant galaxies and celestial phenomena.

Front

What is the difference between a star and a planet?

Back

A star is a luminous celestial body that generates energy through nuclear fusion, while a planet is a celestial body that orbits a star and does not produce its own light.

Front

What is a black hole?

Back

A black hole is a region of space where the gravitational pull is so strong that nothing, not even light, can escape from it.