In no particular order:

Lennon and McCartney

Garcia and Hunter

Gilmore and Waters

Elton John and Bernie Taupin

Burt Bacharach and Hal David

I would say that is extremely common. I and most people I know do the same thing.

What gets kind of awesome is revisiting artists/albums as you get older, and the perspectives can change, usually for the better.

The distance is really hard for me to really understand. Currently the fastest manned vehicle we have has been capable of about 17,000 mph. At that speed it would take right around a 855600 years to reach 667CC. I'm sure we'll wait for better technology before attempting that kind of trip.

Non-carbon based lifeforms - definitely hypothetically possible. Unfortunately we don't currently have evidence of lifeforms using anything but carbon biochemistry. My personal belief is it is absolutely possible. Silicon has quite a few similarities to carbon and that's just an example of life having an analogous biochemistry. Who knows what's possible with the diversity that could be experienced in different environments?

Thank you so much!

So there is no more specific word? That is a little frustrating.

I am going to coin a few words that will make linguists cry as it will separate bits of the Greek but still have relevance:

Viewmonic: A visual reference to remember something important, specifically a visual clue to remind oneself of something that needs to be accomplished.

1: A specific landmark that is followed in directions. (e.g., :"After the large tree on the corner, take the third right".)

2: An item placed in an odd location as a reminder to do something specific. (e.g., "The large red bow wrapped around the door handle reminded them to get their lunch before leaving for work".)

Cuemonic: As above.

Is there a word for a visual reminder?

Not a visual mnemonic so much as something that makes you remember some specific process or task?

I'm thinking along the lines of visual landmarks to remember when to turn when driving - turn left after the gas station with a giant tree.

Or leaving something out of place in a conspicuous area to remind yourself that something needs to be done.

Essentially, the word for a visual "make you think about something relevant".

Within the solar system, besides Earth, Mars and Venus.

Outside of the solar system, GLIESE 667CC and KEPLER-22B. There are a fair number of other contenders but we just don't know...yet.

There have been children with complete hemispherectomy's develop cognitively and otherwise with much success.