Which one of the following is bigger in size?Group of answer choicesOur solar systema planetthe SunA galaxyAsteroid

To determine which one is bigger in size among the given options, let's analyze each one step by step:

1. Our solar system: This includes the Sun, planets, moons, asteroids, comets, and other objects bound by the Sun's gravity. It spans a vast distance, with the outer edge of the solar system (the Oort Cloud) being about 100,000 astronomical units (AU) from the Sun.

2. A planet: Planets are celestial bodies that orbit a star. In our solar system, planets vary in size, with Jupiter being the largest. However, even the largest planet is much smaller than the solar system itself.

3. The Sun: The Sun is a star at the center of our solar system. It is massive compared to planets but still much smaller than the solar system as a whole.

4. A galaxy: A galaxy is a massive system of stars, stellar remnants, interstellar gas, dust, and dark matter, bound together by gravity. Our galaxy, the Milky Way, contains billions of stars, including our solar system, and spans about 100,000 light-years in diameter.

5. Asteroid: Asteroids are small rocky bodies that orbit the Sun. They are much smaller than planets, the Sun, the solar system, and galaxies.

Comparing these:

• An asteroid is the smallest.
• A planet is larger than an asteroid.
• The Sun is larger than any planet.
• Our solar system is larger than the Sun.
• A galaxy is the largest, encompassing billions of stars and solar systems.

Therefore, the biggest in size is a galaxy.