You need your Space Administrator to check the Space Permissions configuration - they need to specifically include an access type as "anonymous"
Of course you can have specific User login as well as the anonymous where the registered Users have extra permissions to do certain things - normally you would block anonymous from creating/editing content as anyone could then totally stuff up your Space and you wouldn't know who did it.
If anonymous is done properly then people don't need to login to see the Space ... e.g. https://ideology.atlassian.net/wiki/display/AP/Applications+Home
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