In Helldivers 2, Super Earth is in a Galactic War with the Automatons (robots) and the Terminids (bugs). During gameplay, you can choose to either attack the robots or the bugs. There are roughly 8-12 planets at any given time that you are allowed to play on, with the ultimate goal of liberating the planets and restoring democracy.

The Galactic War status is global among all Helldivers players, and each and every Helldiver player victory contributes to liberating planets.

This site shows all of the planets that you can play on at any given time, whether to Liberate or Defend the planet from an attack. In addition, it shows the current Liberation progress as well as an estimated time for the planet to be complete

On the top of the site is a brief overview of the main movers in the Galactic War

If you click on a planet in the table, you can see the history.

On the map, there are pins for each active planet that includes its liberation status as well as the rate of liberation.

• Each planet has an internal max HP. When attacking, the planet has 1000000. When defending, this varies from 600k-~2mil.
• Each planet regens HP, usually ranging from 1.5% to 4.5% per hour, but has been seen as high as 20% per hour. The game master can change these values at any time. NOTE - defense campaign doesn't regen hp, it is purely timer based
• Each Operation a Helldiver completes deals damage to the planet.
• The automatons can also drop a giant nuke on planets to deplete some liberation. This can be seen on planets such as Tien Kwan. These drastic dips in liberation have been 1-2%, occuring as much as 5-10 times to keep Super Earth at bay.

Does abandoning an operation negatively impact the %?

No, it does not.

Why do all the planets seem to reset their status everyday?

Bugs and bots DO NOT sleep, they are constantly pushing back (hp regen). So overnight, when Americans (the biggest player base) are sleeping, the bugs and bots take back a lot of the planet. See the 2nd bullet in how Liberation math works.

What is the deal with "Other Planets"?

This is people who are playing the game as an individual, and are having very little impact to the galactic war. They are dealing less damage than the planet regens health, so it's constantly at full health. NOTE - the game master can account for this, so they aren't negatively impacting the userbase.

What are supply lines/connections on the map?

Check out this great guide on Reddit.