NASA's Voyager 1 probe is nearing a significant milestone in space travel, with some outlets reporting it will become the first object to reach one light-day from Earth, although the exact timing is not consistent across reports. As the probe approaches this milestone, it is running out of power, prompting NASA to shut down some of its instruments to conserve energy. The spacecraft, which has been operational for nearly 50 years, is expected to eventually go silent as it continues on its interstellar journey.