A 1/4 scale model size of NASA's solar-powered Juno spacecraft is displayed at the Jet Propulsion Laboratory in Pasadena, Calif. on Friday, July 1, 2016. The spacecraft is on the final leg of a five-year, 1.8 billion-mile voyage to the biggest planet in the solar system. It's expected to reach Jupiter and go into orbit around the planet on July 4.
A 1/4 scale model size of NASA's solar-powered Juno spacecraft is displayed at the Jet Propulsion Laboratory in Pasadena, Calif. on Friday, July 1, 2016. The spacecraft is on the final leg of a five-year, 1.8 billion-mile voyage to the biggest planet in the solar system. It's expected to reach Jupiter and go into orbit around the planet on July 4. Richard Vogel AP
A 1/4 scale model size of NASA's solar-powered Juno spacecraft is displayed at the Jet Propulsion Laboratory in Pasadena, Calif. on Friday, July 1, 2016. The spacecraft is on the final leg of a five-year, 1.8 billion-mile voyage to the biggest planet in the solar system. It's expected to reach Jupiter and go into orbit around the planet on July 4. Richard Vogel AP