NASA's Hubble and Webb discover ancient worlds that remember their past

NASA’s Hubble and James Webb Space Telescopes have uncovered surprising clues about the solar system’s origins by studying 27 tiny, distant objects beyond Neptune. Scientists discovered that these ancient building blocks of planets have remained remarkably unchanged for billions of years, while their unexpected sizes and numbers challenge existing theories of planet formation. NASA’s Hubble and Webb discover ancient worlds that remember their past.

Often more than 100 million times dimmer than objects visible to the unaided eye, TNOs are so small that even with NASA’s Hubble and Webb space telescopes, they appear only as tiny points of light. The findings challenge expectations about how planets form and suggest that these distant, icy bodies have preserved evidence of their origins for billions of years. For the first time, astronomers combined observations from Hubble and Webb to investigate trans-Neptunian objects (TNOs), tiny bodies that travel around the Sun far beyond Neptune’s orbit.

Researchers discovered 27 previously unknown objects, but their findings revealed an unexpected puzzle. There were fewer small objects than some theories predicted, and their colors closely resembled those of much larger objects in the same distant regions. These frozen remnants offer a rare opportunity to study the materials that eventually became planets.