Very easily - the internet. The internet is a very, very good source for information, even in laymens terms for stuff regarding every topic.

I used to study astronomy on a low level and found awesome information at Astronomy Today.
Source(s):
http://www.astronomytoday.com/cosmology.html

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One place to look would be iTunes University where many schools post videos of their lectures for free. I have watched physics with walter lewin from MIT who is amazing, but I am sure you can find an intro class that will not only satisfy your desire to learn but also introduce you to some of the "sci-speak" slowly so that it all makes sense.
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I HIGHLY recommend reading "A Short History of Nearly Everything" by Bill Bryson. It is 500+ pages long, but is not a daunting read. I haven't finished the book yet, but so far it has been an amazing read and is not filled with sci-speak!

Please check out the extremely high reviews on Amazon. This book is rated 4.5 stars with 639 reviews!
Source(s):
http://www.amazon.com/Short-History-Nearly-Everything/dp/076790818X/

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"The Elegant Universe" by Brian Greene is a great starting point
it is about String Theory but to understand why we need String Theory he
goes in to great detail about Theory of Relativity and Quantum Mechanics and all in plain English,
Source(s):
I read the book

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A great place to start is the Internet. Specifically, the podcast Astronomy Cast, and the blog Bad Astronomy.

Astromony Cast is a weekly podcast that picks a different topic every week and goes into it in detail. But they keep it as basic as possible so that a layperson can understand it. They also do a regular Q&A show with people's questions.

Bad Astronomy is a blog run by PhD Astronomer Phil Plait. He talks about astronomy as well as critical thinking and anti-science issues.

These are great entry-level tools to pique your interest about astronomy and also provide lots of different links and resources to find more details if you like.

Also, any book by Carl Sagan is good. He's got a great ability to explain things in plain language. Although some of his science might be somewhat out of date.

A current version of Stephen Hawking's "A Brief History of Time" is also a good start. It's a bit complex, but it only actually has one equation in it, which is E=MC^2.
Source(s):
http://www.astronomycast.com/

http://blogs.discovermagazine.com/badastronomy/

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Well that's very enterprising on your part personally I am of the opinion that you should not let a degree limit you and that knowledge is universal. So whethre you have a degree or not just proceed to learn new things just for the sake of improving your knowledge.
Back to the matter at hand there is a site that i have used previously for cambridge university in the uk it takes you through the topics in a very gradual non sci-speak way,it will give a good foundation on general,special relativity,blackholes,cosmology e.t all.I have also given you a link to a site that acts like a directory for such similar and easy to use sites,though some links are broken it should act as a good foundation to the subject.
I hope that information was worthwhile.
Source(s):
http://www.damtp.cam.ac.uk/user/gr/public/index.html
http://casa.colorado.edu/~ajsh/relativity.html

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