Come from a region of icy bodies beyond neptune called the kuiper belt and they orbit the sun less than 200 years?
a. long-period comets
b. oort comets
c. passing asteroids
d. short-period comets

What is the main difference between primary and secondary sources? a. primary sources are historical documents, and secondary sources are modern-day documents. b. primary sources are derived from museums and archives, and secondary sources are created by history students and academics. c. primary sources are found in ancient places with a rich history, and secondary sources are found in historical journals and blogs. d. primary sources are created during a particular historical era, and secondary sources are created by studying primary sources.