Database keeps starting in SQL Database Logs

I have just installed my first SQL Server database. Its on a Windows XP machine. I installed SQL Server 2008 R2 Express with Advanced Services.

I am just checking the logs for the first time and in the SQL Server Logs, I am getting a message over and over every few minutes:

Starting up database 'AdventureWorks2008R2'

This goes on for about 10 or 12 hours, then the message changes to a different database:

Starting up database 'ReportServer$TESTSQL2K8R2TempDB'.

Then it changes to another database on so on. Is this normal?

Cheers