Solar System/Planets?

Question

What are some of the space probes/years that were sent to mercury, venus, earth, mars, jupiter, saturn, uranus, and neptune?
what are some notable surface features on any of the planets?
which planets have an atmosphere and what is it made of?
what are each of the planets made of?

Answer 1

As 2nd post suggests, use the nasa website for info on interplanetary exploration.
I'm just gonna pile in some random facts.
- Venus is really really similar to earth. Virtually same size, similar atmospheric density, but much higher concentrations of CO2. It is also much hotter, and observations of Venus are some of the original scientific basis for CO2 being a powerful heat-trapping gas.
- Beyond the asteroid belt (Jupiter -->), the planets are bigger, colder, gaseous. They have relatively small but really really dense solid cores, and then the atmospheres are various heavier gases at extraordinary pressure. Scientific investigations are more focused on the moons of these planets, which are big enough to be similar to earth in many ways.

Answer 2

Mariner 1 and 2 were sent to Venus and Mercury. Voyager explored Jupiter, Saturn, Uranus, and Neptune. This spacecraft is now well beyond the orbits of all of the planets, and about to leave the solar system.
As for your other questions, visit http://www.wikipedia.org and look for the stuff you need answers to.

Answer 3

While you have asked far too many questions for me to possibly find al the the answers now that I need to be ready for work, here is the link to the NASA website, that will give you some idea of the planetary features.

Try using a search engine (I recommend dogpile) in your search for your information. I'll includethe engine's link for you as well.

Answer 4

I am at your service...However, you have asked entirely to much in one question.