How to enter galaxian war

How can i enter? Thx you

You can only enter galaxy arena at some hours and days .
To enter go with your mouse on the first icon in the menu on the right of the screen .
Then you'll see an icon who look like a fist then click on athena , then on the green button at the bottom.

hi, can you tell what is galaxy war? is that just normal pvp or mass pvp? ty in advance ^^

its normal pvp

is there any Weekly Guild War or Territorial war in this game?

yeah there are a guild's war every satursday at 22:00 in game time.
And there is a territory war but i don't remember the day and the time.

The territory war take place every friday at 20:00 game time (gt); there is a fee to participate (the first time, to create a 'base', it is very expensive, several millions of gold (sorry, not in game right now and i don't remember exactly how much)).
There is 5 fields (Athena, Poseidon, Hades, Apollo, Ares); in each one there a number of "domains" to conquer. Some are more important/richer than others. This wealth influence the wage (see below).

Occupied domains provide to Guilds alliances (up to five guilds in the same) some shared wage, the guild members can collect them each (and once a) day from monday (10:00 gt) to friday (19:00 gt).

To see the fields and domains, go on guild interface (key 'P' by default), click on the one before the last button (from left to right), then click on top grey button on theright of the panel.
To collect wages, same panel, click on the left and low grey button (the one you can, the other is for guild leader);
To participate, click on the left tab of three under the red ribbon: appears two lists od domains attacked or attacking. The first part is the one of your guild, the second and lower list is the domains of other guild of alliance. When the countdown is 0, click on button right of it to enter.