Science What is the circle that Earth’s axis traces out in its 26,000-year precession cycle? What bright stars would be close to it?
Science When will Comet Halley next pass near Earth? Are there any other comets that will come close enough to our planet that people in the United States can see it at night?
Science Is it possible that the gravitational effects attributed to dark matter could be caused by Jupiter-sized planets discovered orbiting other stars and also floating freely outside planetary systems?
