The Solar System

Seeing as how this was written before December 21, 2012, and is probably a reference to the so-called 'Nibiru Cataclysm' involving a massive rogue planet, I can tell you in 2015 that this is not the case. While there are dwarf planets (such as Sedna) orbiting the sun on extremely eccentric paths, there is no gas giant threatening to obliterate Earth. However, as of January 2015, scientists at the Computense University of Madrid claim to have found evidence for two Earth-sized or bigger planets lurking deep in the outer solar system, but the claim at the time of this writing is so new that there is little input from other scientists or corroborative testing by other reputable establishments to give credence to this report.

Telescopes have allowed us to see further than the naked eye would ever allow. With the invention of the telescope by Hans Lipperhey, mankind has discovered new planets, constellations and threats to our planet such as comets or meteors. Telescopes have also been one of the main reasons that man has begun to explore space, we see things out there worth discovering and taking a closer look at.

The highway system wes derived from plans set forth and implemented by former president Dwight D. Eisenhower. While in office, he structured a project that would change the transportation capabilities for the future. While originally designed and purposed for the national defense system, the highways would provide lanes of which mass transit by military vehicles can travel in case of an emergency and/or military planes have landing and take-of points. The highways also were designed for residents to flee, in case of an emergency, without jamming the rural roadways. It gives residents a direct evacuation route in any direction and can accomodate the mass number of people needing to evacuate.

a telescope because if you never heard of the Hubble telescope that is like the international telescope.

Planets like HD 189733 b, sometimes called "hot Jupiters" are one of the most common types of planets to be detected, largely because they are the easiest to detect. Such planets likely form at a great distance from their parent stars, but their orbits decay, bringing them extremely close to their stars. Hot Jupiters often slowly lose their atmospheres.

The inner planets, Mercury, Venus, Earth, and Mars, are mostly rock and iron. The outer planets, Jupiter, Saturn, Uranus, and Neptune, are much larger and are mostly hydrogen, helium, and ice.

I have school on pa cyber i was wondering the same thing

Voyager 1 and Voyager 2.

There is a matter of some debate as to whether the two Voyager probes have actually left the solar system, an where the "edge" of the solar system actually is. Both are beyond the orbit of Pluto, but have not passed beyond the vaguely-defined Kuiper Belt, and the two probes are just approaching the heliopause, the boundary layer between the solar wind and the broader currents of interstellar space.

But it seems likely that however that boundary is defined, the two Voyager probes either were or will be the first man-made objects to pass it.

because where they are today is where they formed. by where they are i mean how far away they are from the sun. but the universe is always changing.

Inferior planets (Mercury and Venus) can never be opposite to the Sun, since they are nearer to the Sun than we are. Therefore, it follows that they can't be seen next to a full moon, which is opposite to the Sun in the sky.

Jupiter is the largest object that orbits the sun.

Well, you don't want to send a probe to one location in space where a planet doesn't obit, it would be pointless. So knowing the orbits of the planets help you send whatever you're trying to send to the right location, and not just a random spot in space.

The planets Uranus and Neptune were discovered only in modern times after the heliocentric model had been generally accepted.

... more massive (it has more mass).

... more massive (it has more mass).

... more massive (it has more mass).

... more massive (it has more mass).

a group of people that invaded India and developed the caste system

ASTROID!

There is probably nothing unique about our solar system. Scientists once thought that planets might be rare, but we're finding that planets appear to be as common as dirt; we know of over 400 "exoplanets" circling other stars.

So far, our technology isn't good enough to locate a planet as small as Earth, but with big planets as common as they are, there's no reason to think that "ordinary" worlds will be any more rare.

The geocentric system uses epicycles in order to create a model in which the earth is in the center of the solar system and the planets and sun look the way they actually look from the earth with the naked eye. The idea of epicycles was added by Ptolemy because without them his model was not consistent with what the ancients recorded about the position of the planets, the sun and the moon. It was important that the model be consistent with observation since the model was used for navigation and land travel. Once the telescope came into being it was evident that the geocentric model (which included the epicycles) was not consistent with was now observable in the sky, such as the way that Venus looked at different times of years (the phases of Venus). Therefore the geocentric model was abandoned for the heliocentric model. The heliocentric model's predicted movements that were closer to what was observable with the new technology. The heliocentric model does not "need" epicycles, in fact they would lead to false predictions inconsistent with what was observable.

There is no maximum number, and "nebular theory" has been knocked for a loop by the recent discoveries of 400+ "extra-solar planets" - planets orbiting other stars.

Classical theories predicted that planetary systems would be rare; however, it seems that every nearby star we've looked at recently has been discovered to have planets - LOTS of planets.

According to modern understanding, the planets, and the Sun, move around the Solar System's center of mass. Since the Sun is much more massive than the planets, this center of mass is very close to the Sun.

If the Sun is much larger than any of the planets, it seems likely that it also has a greater mass - assuming that their respective densities are somewhat similar. And indeed, this is the case here.

Galaxies are held together by gravity. So are Solar Systems. In the case of galaxies, and galaxy clusters, it isn't entirely clear what type of masses provide this gravity - the amount of known matter is simply too small, by a factor of 5-10. For more information, do some reading on "dark matter".

All of it - to - a single photon.