The Solar System

Terrestrial planets have terra firma, a.k.a. hard ground. The gas giants are giant balls of gas.

Its just a cratered big rock.

The heliocentric 'theory' is not really a theory at all, more an assertion that the Sun is at the centre of the solar system.

Copernicus's theory assumes that the Sun is at the centre and provides a model of the planets' orbits that uses circles and epicycles to explain the observed orbits.

He said it was simpler than the old "geocentric" (Earth centred) Ptolemaic system, but it was not really, it actually had more epicycles.

Note: Perhaps the questioner got mixed up. The Copernican theory IS

a heliocentric theory.

Perhaps the question is about the geocentric theory and the Copernican theory.

Anyway, Kepler simplified the heliocentric theory and now we know that his model is correct.

They make circle like shapes except one part of this circle is closer and one part is farther. But before 2009, pluto would go in an oval like pattern and even get closer to the Sun than Neptune at some times.

-Atom Beaker

Pony Scientist

Ponyville Wing

d) The Sun.

Fire

When the lighted part of the moon grows it is a "waxing moon".

it may be overheating, possibly due to a burnt out fan, or being pushed too hard, or there may be a bad connection

Mercury and Venus, because their orbits are closer to the Sun than Earth' orbit is.

kepler determined the planetary orbits were elliptical

Yes, Jupiter is the fifth planet from the sun and it is the largest planet in the Solar System.

The universe is older

The Pirates have the following teams in their farm system for 2007: 1) Indianapolis Indians - International League - AAA
2) Altoona Curve - Eastern League - AA
3) Lynchburg Hillcats - Carolina League - A
4) Hickory Crawdads - South Atlantic League - A
5) State College Spikes - New York Pennsylvania League - A
6) GCL Pirates - Gulf Coast League - Rookie

It never rains or snows on the Moon because it has no atmosphere. One can generally assume, though, that if a planet has an atmosphere, precipitation will occur at some point.

It does rain on Venus, but the rain is made of sulfuric acid. The rain probably never reaches the ground because it evaporates first in the high temperatures.

(Also, it seems to rain liquid methane on Titan, a moon of Saturn.)

Uranus is in the heliocentric system like all the other planets. The geocentric system is now only of interest historically. It wasn't correct.

they all have the same parents, so they're siblings. Metophorically speaking xo

We've visited all planets in the solar system in one form or another; some we've landed on, others we've observed either by means of satellite or a probe. We've even landed on a couple of moons; ours and Saturn's Titan.

Of the planets we've landed on, those include Mars and Venus.

We've been to mars many times; the lastest of course is the Mars Phoenix lander and before that, rovers "Opportunity" and "Spirt". But even so, i'd have to say we don't know know anything really. 10 percent i'd say? Hell, if we discovered even about 10 percent, i'd say we'd have found a cure for afew major diseases. But, us, as humanity, we still have alot to learn about the universe (:

Saturn

The origin is in the random motions of all the particles that came together under the mutual force of gravity.

Suppose two objects approach each other, but don't actually collide. If they come close enough the force of attraction between them causes them to go into an orbit round each other (round their common centre of gravity).

In a cloud of particle the same basic process produces a spinning disc which with further compression can eventually produce a star.

More or less the same materials that are in the Solar System today - except that our Sun must already have converted a significant amount of hydrogen-1 to helium-4 in the meantime.

So, the original materials must have been: mainly hydrogen-1, less hydrogen-2 (deuterium) and helium-4, and only fairly small amounts of the so-called "metals", i.e., any heavier elements.

Of course, those heavier elements were essential in the formation of the Earth and hence the existence of life in the solar system.

FALSE

Planet Earth.One astronomical unit is roughly the distance between planet Earth and the Sun.

We will have a pretty sight in the night sky. When it explodes, Betelgeuse is predicted to be almost as bright as a full moon in our night sky for a few weeks. Scientists will also learn a lot about supernovas, from being able to observe one happening relatively close. But, Betelgeuse is too far away to do any damage to Earth.

It is far colder than Earth. The Kuiper Belt is very far from the warming influence of the sun. Subatnce that are normally gasses for us such as carbon diozixe and methane are frozen solid in the Kuiper Belt.