Dr. Sky is joined by guest host Dr. Karl Hricko and Dr. David Tholen, the astronomer who discovered asteroid 99942 Apophis, for an in-depth discussion about the asteroid’s highly anticipated close approach to Earth in 2029.Dr. Tholen provides a fascinating technical look at Apophis’s initial discovery, physical characteristics, and the mathematical calculations used to determine that it poses no threat of impacting Earth for at least the next century.The conversation also explores interstellar objects, galactic physics, space exploration, and the deeper philosophical questions surrounding human consciousness and our place in the universe.