Comets can enter the solar system's inner regions from the Kuiper Belt or the Oort Cloud1. These regions are beyond Neptune and contain millions of icy leftovers from the solar system's beginning1. Comets are sent plunging inward by gravitational nudges until they swing around the Sun and out again1. Scientists believe that comets from the Oort Cloud were probably once part of the solar system but were kicked out by gravitational interactions with larger planets such as Saturn and Neptune2.
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measurements by the (ALMA) in 2021 estimate a maximum diameter of 137 ± 17 km (85 ± 11 mi) for C/2014 UN271's , assuming negligible contamination of the nucleus's thermal emission by an unseen dust coma. The ALMA measurements have not ruled out the possibility of a dust coma contaminating up to 24% of the nucleu.
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