Star Power (Astronaut Girl, Bk. 2) by Cathy Hapka: Everyone knows that humans can't travel to the sun.
. . at least that's true in the year 2020. But when Astronaut Girl, Wallace, and the Astro crew find themselves orbiting the sun in a solar probe, they soon discover that they've gone almost one thousand years into the future! As they are zipping through space, the heat shields on their spacecraft come loose. They must find a way to fix it and get back to Earth in time for Wallace's family barbecue and before their probe gets baked like a potato!
Perfect for 4 - 7 years readers and fans of readers - chapter books.