Metroid Prime: Who sent the distress signal?

In the beginning of Metroid Prime, the opening cut scene shows Samus receiving a distress signal coming from a research station orbiting above Talon IV.
It turns out the research station is being used by Space Pirates for all sorts of nefarious research.
Who sent this distress signal?
The Space Pirates certainly wouldn't want to attract attention, least of all from Samus Aran.
Were there civilians aboard the research station before the Space Pirates took over? Did they send the signal?
Talon IV is uninhabited (asides from Space Pirates). Another wild theory of mine is that the Chozo decided to make a device that turned in X years to send a distrsss signal, luring Samus to Talon IV, cause they have prescience or whatever.
Pictures about "Metroid Prime: Who sent the distress signal?"



Metroid Prime (Beta Version) - Distress Signal
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Asad Photo Maldives, Asad Photo Maldives, Yan Krukov, Ketut Subiyanto