I'm about to start on an Exploring Adventure, how do you know if it's an EL planet as soon as you get to the star system, Advance Scanner + Detailed Scanner tells you they type of planet without going up to it?
No, it doesn't tell you what kind of planet it is, you still need to explore it. However if you use your advanced scanner (also known as the foghorn) as you enter a system it will give you a picture of what planets there are if you look at the systems map. From there you have to look at it by eye. There have been a few times I have thought that there was a EL planet in a system only to be disappointed when i go and scan it and find its only a water world.
Here is a picture of the different planets to help you classify before scanning.

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