The mass of Jupiter is 1,898 * 1024 kilograms. The mass of Earth is 5.97 * 1024 kilograms. The mass of the Sun is 1,989,000 * 1024 kilograms.

Our Solar system is composed of mainly 8 planets (excluding Pluto as a planet, after further research done). So, we have our Sun, the big bright giant at the center of the solar system, while all the celestial bodies revolving around it in a very specific path.

Explanation:

Here we are been provided by 2 planets in our solar system and the Sun, which is present at the center of the system.

Jupiter:

It is attributed as the biggest of all among the solar system and it comes 5th in the row inside our solar system. As its mass is about one-thousandth that of our Sun. While the actual mass of planet is about 1.898 * 10^27 kg in total.

Our Earth:

It is believed to be the only habitable planet in the universe known to us till now. As it comes 3rd in the row counting from Mercury inside the solar system. While the total mass of the planet Earth is about 5.97 * 1024 kilograms.

The Sun:

A big giant star is positioned in the center of our solar system, which is also attributed as the big red giant. It is called as the Sun in a more formal way. The big giant star is also held responsible for supporting the possibility to have life on our planet the Earth. While the the mass of the Sun is approximately 1.989 * 10^30 kg in total.

Based on mass, the number of Earths that could fit inside Jupiter is about 318. The number of Jupiter's that could fit inside the Sun is nearly 1,048