Here's why:
* Mass and Gravity: The Sun is much more massive than Earth (about 333,000 times more massive). The stronger the mass of an object, the stronger its gravitational pull.
* Distance: The Sun's gravity is also stronger because it's much closer to space dust than Earth. Gravity weakens with distance, so objects farther away feel a weaker pull.
Think of it like this: The Sun is like a giant magnet, and the Earth is like a smaller magnet. The Sun's magnet is so powerful that it attracts most of the space dust in the solar system. Earth, being much weaker, can only hold onto a small amount of dust.
However, Earth does attract space dust. We can actually see this dust as shooting stars (meteors) when it enters our atmosphere and burns up. It's just that the Sun attracts a lot more than Earth does!