The Solar System

Most of the mass in the solar system is contained in the Sun. The sun makes up 99.85% of the total mass.

Oooh, ineresting one! Depends what you mean by youngest. The actual matter was all made in the time after the Big Bang. More specific elements were made in a previous supernova explosion. Our sun is a second or third generation star and so the planets around it are made from the accretion disk formed during the formation of the solar system. From that point of view, all the planets could be said to have the same age!

However, if you mean the surface structure, then there are a few contenders. Earth's surface (along with the surface of our moon) are believed to be the product of a massive celestial collision millions of years ago which actually melted the entire surface of the earth! This then cooled and solidified, forming the crust. This therefore means the surface of earth could be considered relatively young.

Another contender is the Gas Giants. They're never really the same. They have similar structures within them but their internal structure and outer enormous storms are ever-changing and so it could be said that they are eternally young.

Pick the one that sounds most likely. Most people will say that they're all as old as each other. What do you think?

what evidence did ptolemy have for the solar system

Somewhere around 26,000 light-years.

the sun

The solar system is natural.

If the cause is great then it's called a 'Rebel' and if something is worth fighting for it sure is an exhilerating feeling. Sometimes certain systems or even government need to be challenged to keep them on their toes and to change things for the better. Without 'rebel personalities' (in a peaceful manner and hitting by words and not causing riots or harming a person) this can have a great impact when it comes to changing things for the better.

The distinguishing feature is that a brown dwarf gets hot enough to fuse deuterium (hydrogen-2), but not hot enough to fuse hydrogen-1.

It is mainly due to the vast distances involved, compared with the relative small size of the planet.

To put it into perspective, a planet in orbit around a star 10 light years away (relatively close for a star) is 60 trillion miles away (60,000,000,000,000). The distance of Neptune (furthest planet in our solar system) is around 3.7 billion miles away (3,700,000,000). So the Exoplanet in this example is roughly 16000 times that distance.

The brightness of the star also overwhelms the nearby planets in orbit around it. Planets are much smaller than stars and tend not to emit light.

They orbit an average star at an average distance from the centre of the milky way, which has an average G2 spectrum and a very average absolute magnitude of +4.7. It occupies a very average position on the HR diagram.

When a star explodes, many dust particles get pulled together to form stars, planets, and moons. Once the particles start to group, smaller bodies will rotate around bigger bodies. With collisions narrowing down what bodies will last, all the little individual particles are formed into those stars, planets, and moons. Moons are generally formed by particles shot out in space during collisions.

Let's get our nomenclature right here.

Alpha Centauri is a triple star system: Alpha Centauri A and Alpha Centauri B are a fairly close double of stars roughly like the Sun, and Alpha Centauri C is a much dimmer red dwarf orbiting the pair at a considerably greater distance.

It just so happens that C's orbit brings it at times closer to the Sun than any other star that we currently know about. So Alpha Centauri C is sometimes itself called Proxima.

Physical mass (of the sun and the planets, plus asteroids, etc.) plus space.

No.

A sun is an astronomical body that is, in its core, fusing lighter elements into heavier ones. This fusion process releases energy which causes the star to emit light.

Suns can be of vairious sizes and two suns can orbit one another in a manner similar to a planet and a star.

However whatever the orbital configuration, if a body is producing light by means of thermonuclear fusion, it is a star.

Neptune
Neptune is the fourth largest planet out of the eight in our solar system, after Jupiter, Saturn and Uranus.

The main ones are: The Sun, Mercury (a weak field only), Earth, Jupiter, Saturn, Uranus, and Neptune.

So, that's seven bodies.

Heliocentric.

it is how circular and asteroids orbit path is.

Yes, our Sun is in the centre of our solar system.

Technically, there could possibly be life on Pluto.

Think about this: humans and other animals on earth need the warmth and oxygen. Just because humans and other animals on earth need oxygen, water and warmth to survive, doesn't mean that other types of creatures need this. How do we know that there is not a species living on Pluto that thrives of methane and needs the cold instead of the warmth to survive?

However, the New Horizons spacecraft reached Pluto 2015 and didn't detect any life from orbit.

The main differences are in terms of planetary compositions and orbital configurations. Many extrasolar planetary systems have "hot Jupiters" (large gas giants close to their stars) and multiple planets in close orbits, while our Solar System has terrestrial planets closer to the Sun and gas giants farther out, with more orderly orbital patterns. Additionally, many extrasolar systems have larger populations of smaller planets than our Solar System.

The orbital plane of a stellar system can be oriented in any way in relation to the plane of the Milky Way Galaxy. Our solar system, for example, is almost perpendicular to the plane of the Milky Way Galaxy.

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