Awe-inspiring photos of Earth remind us just what's at stake

Millions of people came out this Earth Day to clean up and care for the planet. But space agencies and companies took a different approach, choosing to celebrate our Earth from up above.

SpaceX on Saturday shared a breathtaking image captured during the recent launch of its SES-10 communications satellite. 

Elon Musk's private spaceflight company made history in late March when it reused a previously flown Falcon 9 booster to launch the satellite over Central and South America.

NASA also posted plenty of Earth-centric images taken during previous missions. 

SEE ALSO: Google Doodle uses furry animals to deliver an Earth Day message

Its "Postcards from Home" collection, first assembled for 2015's Earth Day, includes snapshots from the unmanned Galileo spacecraft, the moon-mapping Clementine mission, and even the Apollo 8 mission in 1968. That mission's iconic "Earthrise" images show our planet peeking out from beyond the Moon's surface as the first crewed spacecraft circumnavigated the Moon.

Astronauts from the International Space Station (ISS), European Space Agency, and Canadian Space Agency shared their own awe-inspiring views of the giant orb we call home.

Picking up trash, planting trees, and marching to defend scientific research all benefit our planet in real, tangible ways.

But images like these help us appreciate just what's at stake, even from millions of miles away.

WATCH: Neil deGrasse Tyson explains if we can dump our trash on the moon