Light takes 4 years to travel from the nearby star Alpha Centauri to the Earth; consequently, what we see today on Earth happened 4 years ago on the stars of Alpha Centauri. br A closed timelike curve (CTC) is a conjectured path to the past. br The Higgs singlet is a hypothetical byproduct of the Higgs boson; the Higgs singlet only feels the single force of gravity. br br Thanks for watching. Follow for more videos.