NASA recently made a surprising discovery while monitoring a massive asteroid that passed by Earth. The asteroid, named 2011 UL21, was previously estimated to be between 1.1 and 2.4 miles wide, earning it the nickname “planet killer” due to its potential to cause catastrophic damage if it were to impact Earth. However, NASA confirmed that it is not on a collision course with our planet.
During its closest approach to Earth in over a century on June 27, 2011 UL21 was observed by scientists at NASA’s Goldstone Deep Space Communications Complex in California using the Goldstone Solar System Radar telescope. The images revealed that the asteroid is likely around 1 mile wide and has a small moon orbiting it, forming a binary system.
The newly discovered moonlet, which has not been named yet, orbits 2011 UL21 at a distance of around 1.9 miles. This type of small-body satellite is common around asteroids of this size and provides valuable information about their formation. The next opportunity to study 2011 UL21 and its moonlet up close will be in 2089 when they approach within 1.7 million miles of Earth.
In addition to this discovery, NASA also observed another asteroid named 2024 MK as it passed by Earth closer than the moon. The images taken by the Goldstone Solar System Radar telescope showed that 2024 MK was knocked off course by the close encounter.
These findings are significant as they provide valuable insights into the formation and behavior of asteroids in our solar system. Understanding the characteristics of these celestial bodies is essential for planetary defense and future space exploration missions.
Harry, a senior staff writer at Live Science, highlighted the importance of these discoveries in expanding our knowledge of space. His background in marine biology and journalism has equipped him to cover a wide range of topics including space exploration, planetary science, and climate change. His work on the upcoming solar maximum was recognized at the National Council for the Training of Journalists (NCTJ) Awards for Excellence in 2023.
By studying asteroids like 2011 UL21 and 2024 MK, scientists can gain valuable insights into the formation and evolution of our solar system. The discovery of a moonlet orbiting a “planet killer” asteroid showcases the complexity and diversity of objects in space, underscoring the importance of continued research and exploration in the field of planetary science.
