What is the term for a cluster of stars bound together by gravity, with a spherical or irregular shape?

Which moon of Jupiter is the largest moon in our solar system and even larger than the planet Mercury?

Which planet is often referred to as the "Evening Star" or the "Morning Star" and is the brightest natural object in the night sky after the Moon?

Which law states that the total electric charge in an isolated system is constant?

What is the largest planet in our solar system?

According to the law of conservation of energy, what happens to the total energy in a closed system?

What is the closest star to Earth?

What is the term for the process by which a river deposits sediment as it loses energy, often forming a fan-shaped landform?

What is the name of the phenomenon where light is bent as it passes through the gravitational field of a massive object, such as a galaxy or cluster of galaxies?

What is the term for the zone of the ocean where light cannot penetrate, and temperatures are low and pressure is high?