|Universe Guide||ASP.NET_SessionId||This is a session only cookie that ASP.NET sites create. The cookie will only last for the time you are looking at the website. You can read more on the Microsoft site but be warned, it can be pretty technical to read.|
|__utma, __utmb, __utmb, __utmz||This is used by Google so it can generate analytics for the site.|
How to disable cookies.
Disabling cookies is possibly in various browsers, which there are easy to follow guides for Firefox and Chrome available, other browers you'll need to look up. For disabling on IE, the steps are straightforward enough, the link is primarily for IE8 on Vista but much of it also applies to IE on Windows 7 and 8. If you do decide to block cookies, blocking 1st party ones can lead to unexpected consequences esp. where the sites are written in ASP.NET, if you can, always allow the ASP.NET_SessionId.