NASAさんのインスタグラム写真 - (NASAInstagram)「On this day in 1906, an entirely new group of asteroids was discovered. These asteroids, now called the Trojans, travel in swarms behind and ahead of Jupiter as it circles the Sun, locked in place by a balancing act of gravity. It’s been 115 years since the first Trojan was found, but no spacecraft has yet visited one. Set to launch later this year, The Lucy mission will change that. More at the link in our bio! Image: Illustration of Eurybates, a Trojan asteroid slated for a visit from the Lucy mission. Credit: NASA's Goddard Space Flight Center Conceptual Image Lab #NASA #spacerock #LucyInTheSkyWithTrojans」2月23日 6時50分