What's Hot This Week Neutron Stars Are Doomed if Vacuum Energy Goes Wild By Charles Q. Choi A mind-bogglingly huge buildup of "vacuum energy," which would occur in just milliseconds, could lead the stellar remnants known as neutron stars to instantly collapse or explode, scientists now suggest.     Curtain to Lift on Alien Planets by the Hundreds By Charles Q. Choi Astronomers have detected close to 500 distant alien worlds so far Ñ one of which is the right distance from its star to sustain liquid water and possibly even life Ñ and new advances are yielding more planet discoveries faster than researchers can verify them.     Sponsored by: Bigelow Aerospace Soars with Private Space Station Deals Dying Star's Last Breath Frozen in Hubble Photo NASA's Monkey Radiation Experiment Faces Unclear Future 6 New Globalstar Communication Satellites Reach Orbit Comet Hartley 2 Ready for Close-up With Earth Wednesday

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