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Large, distant comets more common than previously thought
Comets that take more than 200 years to make one revolution around the sun are notoriously difficult to study. Because they spend most of their time far from our area of the solar system, many "long-period comets" will never approach the sun in a person's lifetime. In fact, those that travel inward from the Oort Cloud—a group of icy bodies beginning roughly 300 billion kilometers away from the sun—can have periods of thousands or even millions of years.
Team uses airborne telescopes to study Sun and Mercury during total solar eclipse
Chasing the Total Solar Eclipse from NASA's WB-57F jets
Venus's turbulent atmosphere
What is the weather like on Mercury?
Russia's Mayak satellite: crowd-funded cosmic pest or welcome nightly visitor?
A final farewell to LISA Pathfinder