Ok, so Steve's comment on "What If" got me thinking about modern20 adventures.
Here's an idea:
A leading astophysicist recently announced that an asteroid, projected by most scientists to narrowly miss the Earth, will in fact hit it. He was kidnapped while leaving his lecture.
The government has charged the PCs with finding the scientist and bringing those responsible to justice. Early reports indicate a UFO cult is responsible.
The adventure would have a "believer" option (aliens *ARE* involved) and a "skeptic" option (aliens? pffffft)
What do ya'll think?