Speed of light they appeared 13 billion years ago, when the universe was less than a billion years old. The fact that more distant objects appear to be younger, due to the finite speed of light, allows astronomers to infer the evolution of stars, of galaxies, and of the universe itself. Astronomical distances are sometimes expressed in light-years, especially in popular science publications and media. A light-year is the distance light travels in one year, around 9461 billion kilometres, 5879 billion miles, or 0.3066 parsecs. In round figures, a light year is nearly 10 trillion kilometres or nearly 6 trillion miles. Proxima Centauri,
Penske PC-26 over from 1996 and remained a Penske-exclusive system. The PC26 proved to be a formidable short oval car, Paul Tracy recorded three victories in Rio, Nazareth and Gateway. The victory at Gateway marked the 99th for the team and the final victory for a Penske Cars-produced chassis. Penske Racing would have to wait three years to gain its 100th victory. The latter part of the season saw a variety of problems including an eye problem for Tracy as well as a lack of raw pace. () (Results in bold indicate pole position; results in "italics" indicate fastest lap) Penske PC-26