The iron cores in the centers of some planets didn't come into existence in these planets; the iron was created in the supernova explosions of ancient stars, and blasted into space during the explosions. Our solar system including the Sun and all the planets was formed as gravity caused the gas & dust clouds in space to fall together.
We're not sure why the Sun got most of the hydrogen, while the planets were formed from primarily the heavier elements. What we can be sure of is that the core of our Sun isn't nearly hot enough or dense enough to fuse lighter elements into iron, and it's a good thing - because fusing elements heavier than iron would suck energy OUT of the core, and cause the Sun to collapse and then explode in a supernova. That'll never be an issue for us, because the Sun will NEVER be hot and dense enough to do that. It doesn't have enough mass.
Yes, because he proves that the geocentric model or earth-centered solar system was wrong and claimed that the sun was the center of the solar system and planets and other bodies revolve around it.
The planets or other cosmic objects are very different, not similar.
Our planet, Earth, is part of a larger system known as the solar system. It revolves around the Sun along with other celestial bodies such as planets, asteroids, and comets. The solar system itself is a part of the Milky Way galaxy, which is just one of billions of galaxies in the universe.
all parts of the planet pulled each other toward the center of the mass by gravity
Because the Solar System is defined as the collection of planets, planetary satellites, comets, asteroids and other debris, centered on the sun.Wherever the sun goes, that's the center of the solar system, because that's the definition of the solar system.
Astronomy
The solar system is the collection of all the planets that revolve around the sun and other smaller bodies. These other bodies include the moon, comets, meteoroids and asteroids among others.
You are wrong! The digestive system produce enzymes and other substances!!!
Its at the centre of the solar system. All the planets and other bodies are in orbit around it.
Yes, because he proves that the geocentric model or earth-centered solar system was wrong and claimed that the sun was the center of the solar system and planets and other bodies revolve around it.
Shooting seismic waves into the planet
I guess you mean "our" solar system, or is this a question from an ET? :D Yes, all celestial bodies are in a state of motion relative to each other. Our solar system is revolving around the center of the Milky Way Galaxy, a process that takes millions of years. The galaxy in turn is moving away from other galaxies.
The sun is the only source of light in the solar system. None of the other bodies can be seen unless illuminated by a flashlight or the sun.
yes yes yes
Firstly, the distances in the solar system are so great that nearly all the interactions are between the Sun and the other bodies. These include gravitational attraction, absorption of electromagnetic radiation from the Sun by other bodies, and interaction of those bodies with the solar wind. Jupiter gives off some radiation, so that should interact with other bodies, and the Earth and Moon reflect light to each other, which should apply to other planets and moons.
Asteroids and Comets.
The immune system certainly does recognize germs and other foreign bodies. The immune system will then try to fight them off.