A soldier who served as a gunnery chief on Eden Prime. A sentinel and staff lieutenant of the SSV Normandy. Edit Attraction — When waking after Eden Prime , Shepard will find either Ashley Williams or Kaidan Alenko waiting at the Commander’s bedside in the medical room, feeling guilty over getting snagged by the Prothean Beacon. Shepard can be reassuring and claim there was no way to know what the beacon would do, at which point Williams or Alenko will look much happier and a little intrigued.

Courting — After completing a primary mission on either Therum , Noveria or Feros , Shepard can speak about the mission with either Ashley or Kaidan and begin building up rapport that gradually grows into a romantic interest.

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The average time interval between extinction events was determined as 26 million years. At the time, two of the identified extinction events Cretaceous—Paleogene and Eocene—Oligocene could be shown to coincide with large impact events. Although Raup and Sepkoski could not identify the cause of their supposed periodicity, they suggested a possible non-terrestrial connection. The challenge to propose a mechanism was quickly addressed by several teams of astronomers.

They found evidence for a signal showing an excess extinction rate with a million-year periodicity, now going back million years, and at a much higher statistical significance than in the older work. They also determined that this periodicity is inconsistent with the Nemesis hypothesis. Whitmire and Albert A. Muller , independently published similar hypotheses to explain Raup and Sepkoski’s extinction periodicity in the same issue of the journal Nature.

This became known as the “Nemesis” or “Death Star” hypothesis. If it does exist, the exact nature of Nemesis is uncertain.