Back in June 2015 we created a list of charities worth supporting. As it's always a good time to support organizations that are changing the world for better we're doing it again.
Abigail Harrison (Aspiring astronaut & scientist, founder and spokesperson for The Mars Generation)
TheMarsGeneration.org which is a nonprofit setup by myself and a team of astronauts, engineers and others. The mission is to excite and educate students and adults about the importance of human space exploration and STEM education to the future of humanity.
The organisation is now in its second year of operation. It is 100% volunteer driven, has provided 10 students with financial need full paid space camp scholarships in 2016 and will do the same for summer of 2017, has over 650 Student Space Ambassadors, over 350 founding members so far and an online following of over 700,000 fans and followers. Last year we reached over 10 million people and we anticipate year two to be even bigger!
Mike Simmons (Founder and CEO of "Astronomers without Borders")
I started Astronomers Without Borders to connect people around the world through our common passion. Now we're doing a lot to advance STEM through astronomy, sharing what those of us have in developed countries with others..
Morgan Rehnberg (PhD student at University of Colorado, works with Cassini to study Saturn’s rings)
I support the Wikimedia Foundation each year because I can't imagine what I'd do for even a day without Wikipedia. Whether it's finding a quick reference for the mass of a moon or a high-resolution copy of the Hubble deep field, basically all the information I could ever want is a click or two away. It's certainly an organization with its share of faults, but I can't imagine the amount of effort it would take to start over from scratch.
Paul Carr (Space Systems engineer at NASA, podcaster, blogger, investigator)
I think there are many worthy charities. I mentioned one of them in the latest episode (64) of the Unseen Podcast: Doctors Without Borders. As for space or astronomy related charities, I have donated at various times to the SETI Institute, the Planetary Society, and the AAVSO. At the AAVSO, you can adopt the variable star of your choice for $20/year, which is a good way to help them.