PASADENA, Calif. (Reuters) - A NASA spacecraft is "healthy and ready" for its July 4 collision with a comet and has already provided images critical to understanding the building blocks of life on Earth, officials said on Friday.
While still roughly 1.5 million miles (2.4 million km) from its target, the fast-moving Deep Impact craft is on track for its Saturday release of a coffee-table sized impactor that is expected to blast a stadium-sized crater into comet Tempel 1.
