completely exceeded expectations and continued to explore through the end of the decade and beyond. 2004 – Scaled Composites' SpaceShipOne becomes the first privately built and operated crewed spacecraft to achieve spaceflight. 2004 – Cassini-Huygens becomes the first space probe to orbit Saturn, with Huygens landing on the moon Titan in 2005. 2006 – As a result of the discovery of Eris, a Kuiper Belt object larger than Pluto, Pluto is demoted to a "dwarf planet" after being considered a planet for 76 years, redefining the solar system to have eight planets and three dwarf planets. 2009 – After having analyzed the data from the LCROSS lunar impact, in 2009 NASA announced that the discovery of a "significant" quantity of water in the Moon's Cabeus crater. 2009 – Astrophysicists studying the universe confirm its age at 13.7 billion years, discover that it will most likely expand forever without limit, and conclude that only 4% of the universe's contents are ordinary matter (the other 96% being still-mysterious dark matter, dark energy, and dark flow). Technology Automobiles Automotive navigation systems become widely popular making it possible to direct vehicles to any destination in real-time as well as detect traffic and suggest alternate routes with the use of GPS navigation devices. Greater interest in future energy development due to global warming and the potential exhaustion of crude oil. Photovoltaics increase in popularity as a result. The Hybrid vehicles market, which became somewhat popular towards the middle of the decade, underwent major advances notably typified by such cars as the Toyota Prius, Ford Escape, and the Honda Insight though by December 2010 they accounted for less than 0.5% of the world cars. Many more computers and other technologies were implemented in vehicles throughout the decade such as: Xenon HID headlights, GPS, DVD players, self-diagnosing systems, memory systems for car settings, back-up sensors and cameras, in-car media systems, MP3 player compatibility, USB drive compatibility, keyless start and entry, satellite radio, voice-activation, cellphone connectivity, HUD (Head-Up-Display) and infrared cameras. In addition, more safety features were implemented in vehicles throughout the decade such as: advanced pre-collision safety systems, Backup cameras, Blind spot monitor, Adaptive cruise control, Adaptive headlamps, Automatic parking, Lane departure warning systems and the Advanced Automatic Collision Notification system Onstar (on all GM models). The sale of Crossovers (CUVs), a type of car-based unibody sports utility vehicle, increased in the 2000s. By 2006, the segment