This weekend, a rare blue micromoon will illuminate the night sky, marking it as the smallest and most distant full moon of the year. A blue moon occurs every two to three years, with May 1 marking the first full moon of this month. The upcoming micromoon will be located 252,360 miles (406,135 kilometers) from Earth, making it appear about 6% smaller and 10% dimmer than an average full moon. Stargazers in southern regions, including Argentina, Chile, New Zealand, and eastern Australia, will enjoy a special treat as the brilliant star Antares will temporarily vanish when the micromoon passes in front of it. Antares, known as the “heart of the scorpion” in the constellation Scorpius, is located 550 light-years away. While those in other parts of the world will see Antares alongside the full moon, the blue moon itself will not take on any blue hues; the term simply refers to the occurrence of two full moons within a single month.