Glossary Welcome antipodal atom Bach, Johann Sebastian bandwidth Big Bang Theory Buddha Buddhism catalyst cell Church cross-pollinate Dervish Deuter Earth Ekagrata electron epiphanic extrapolate fractal hadith hologram Khan, Hazrat Inayat Khan, Pir Vilayat Inayat Khan, Pir Zia Kirlian photography light year magnetic field maya molecule Mosque n-dimensional Nirvana Nirvitarka peri-personal perspicacity Pir o Murshid quintessence Reincarnation retina Samadhi Satipathana Shabistari, Mahmood stalwart Synagogue transducer Vichara Vitarka wave interference light year           Go back Science Light travels at the constant speed of approximately 3 x 108 meters per second in a vacuum. The distance light travels in one year is called a light year and is a commonly used unit of measure in astronomy. From the Earth, the Moon is one light second away. The nearest star, Alpha Centauri is 4.34 light years distant. The Milky Way is about 100,000 light years across.