For that, you'd need either piles of insulation (too bulky) or some way to control the temperature inside the case.

ENGADGET

Technologies being tested in the program include advanced guidance, navigation and control, thermal protection systems, avionics, high temperature structures and seals, conformal reusable insulation, lightweight electromechanical flight systems, and autonomous orbital flight, reentry and landing.

ENGADGET: USAF relaunches its first X-37B on a slightly less mysterious spaceflight