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 Penske PC-26 The Penske PC-26 was designed by Nigel Bennett and manufactured by Penske Cars in Poole, Dorset, for the 1997 CART Championship. Whilst a development of the PC-25, the PC-26 was designed to address the twitchy nature of the previous year's car. Five chassis were produced and driven by Al Unser Jr and Paul Tracy. The Ilmor-produced 850 bhp Mercedes-Benz IC108D engine served as the powerplant, driving through an Xtrac gearbox within a Penske housing. Aerodynamic changes from the previous year's car included revised sidepod inlets and a longer, sharper nose. The Delco Gen V electronics package was carried