4 articles
The discovery of Eris, a massive object in the outer solar system, challenged the definition of a planet. This led to the IAU's 2006 decision to reclassify Pluto as a dwarf planet and establish new criteria for planetary status, expanding our understanding of the solar system's diverse populations.
Astronomers may have found the first evidence of the elusive Planet Nine, a massive hypothetical world in the outer solar system. New analysis of decades-old infrared data reveals a single candidate object, but further observation is needed for confirmation.
New analysis of asteroid light curves is revealing unprecedented details about their rotation, shape, composition, and density. This technique allows scientists to understand these celestial bodies without direct contact, offering vital insights for planetary defense and understanding solar system origins.
Six planets, including Mercury, Venus, Saturn, and Jupiter, will be visible in the night sky during a rare alignment from late February to early March 2026. Telescopes will reveal Uranus and Neptune, offering a stunning celestial parade.
