at about per year. Voyager 2 is expected to pass Pioneer 10 around April 2023. Sunlight takes 18.3 hours to reach Pioneer 10. The brightness of the Sun from the spacecraft is magnitude −16.1. Pioneer 10 is currently in the direction of the constellation Taurus. If left undisturbed, Pioneer 10 and its sister craft Pioneer 11 will join the two Voyager spacecraft and the New Horizons spacecraft in leaving the Solar System to wander the interstellar medium. The Pioneer 10 trajectory is expected to take it in the general direction of the star Aldebaran, currently located at a distance of about 68 light years. If Aldebaran had zero relative velocity, it would require more than two million years for the spacecraft to reach it. Well before that, in about 90,000 years, Pioneer 10 will pass about from the late K-type star HIP 117795. This is the closest stellar flyby in the next few million years of all the four Pioneer and Voyager spacecraft, which are leaving the Solar System. A backup unit, Pioneer H, is currently on display in the "Milestones of Flight" gallery at the National Air and Space Museum in Washington, D.C. Many elements of the mission proved to be critical in the planning of the Voyager program. Pioneer plaque Because it was strongly advocated by Carl Sagan, Pioneer 10 and Pioneer 11 carry a gold-anodized aluminum plaque in case either spacecraft is ever found by intelligent life-forms from another planetary system. The plaques feature the nude figures of a human male and female along with several symbols that are designed to provide information about the origin of the spacecraft. The plaque is attached to the antenna support struts to provide some shielding from interstellar dust. Pioneer 10 in popular media In the film Star Trek V: The Final Frontier, a Klingon Bird-of-Prey destroys Pioneer 10 as target practice. In the speculative fiction 17776, one of the main characters is a sentient Pioneer 10. See also Exploration of Jupiter Pioneer 11, Jupiter and Saturn fly-by Voyager 1 and Voyager 2, Jupiter fly-by en route to other outer Solar System fly-bys Galileo, Jupiter orbiter Cassini–Huygens, Jupiter fly-by for Saturn orbiter and Titan lander, respectively New Horizons, Jupiter flyby en route to Pluto fly-by Juno, Jupiter polar orbiter List of artificial objects leaving the Solar System List of missions to the outer planets Pioneer anomaly Robotic spacecraft Timeline of artificial