When you start off the mission on a platform in the middle of what looks like a giant complex made of stone. When you are heading down to the planet, you see a small video of what looks like a space cockroach getting fried by the suns rays. That is because the sun burned away the atmosphere and it is now highly dangerous. It would be a good idea to sprint through the sun rays to the gate house.
You will find a dead quarian in the gate house and some dead geth around him. A recording is playing in the background saying that the quarian sacrificed himself for the life of Tali Zorah. Search the geth bodies for salvage and a med-kit on the wall, and a ancient safe on the wall. When you open the gate house a geth dropship will drop some geth shocktroopers right in front of you. Engage them.