When was the first trans-Neptunian object discovered?
Pluto emerged from the darkness of space in February 1930. This event marked humanity's first encounter with a trans-Neptunian object.
Questions about Trans-Neptunian object
Short answers, pulled from the story.
What is the distance range for Kuiper belt objects from the Sun?
Kuiper belt objects typically reside between 30 and 55 astronomical units from the Sun. They often follow close-to-circular orbits with small inclinations relative to the ecliptic plane.
How many satellites orbit Pluto according to current data?
Five satellites orbit Pluto making it a complex system. Pluto stands as the first and largest trans-Neptunian object discovered by humanity.
Which spacecraft flew past Pluto in July 2015?
NASA's New Horizons mission launched in January 2006 became the primary spacecraft targeting trans-Neptunian objects. The probe flew past the Pluto system in July 2015 before visiting 486958 Arrokoth in January 2019.
What spectral groups characterize different trans-Neptunian objects?
Recent observations using the James Webb Space Telescope show three distinct spectral groups. Bowl-type spectra feature clear absorption features of water ice alongside silicates and carbon dioxide while Double-Dip spectra belong to reddish objects dominated by carbon dioxide and carbon monoxide.