Comets have three known reservoirs: the roughly spherical Oort Cloud (for long-period
comets), the flattened Kuiper Belt (for ecliptic comets), and, surprisingly, the asteroid belt (for …

We review the evidence for buried ice in the asteroid belt; specifically the questions around
the so-called Main Belt Comets (MBCs). We summarise the evidence for water throughout …

Some asteroids eject dust, unexpectedly producing transient, comet-like comae and tails.
First ascribed to the sublimation of near-surface water ice, mass-losing asteroids (also …

We report on the discovery of stellar occultations, observed with Kepler, which recur
periodically at 15.685 hr intervals, but which vary in depth from a maximum of 1.3% to a …

Seven particles captured by the Stardust Interstellar Dust Collector and returned to Earth for
laboratory analysis have features consistent with an origin in the contemporary interstellar …

The practical distinctions between asteroids and comets, viewed as products of accretion on
either side of the snow line, are less clear-cut than previously understood. In this chapter, we …

Over the past three decades, we have witnessed one of the great revolutions in our
understanding of the cosmos—the dawn of the Exoplanet Era. Where once we knew of just …

Surface shedding of an asteroid is a failure mode where surface materials fly off due to
strong centrifugal forces beyond the critical spin period, while the internal structure does not …

We present archival observations of main-belt asteroid (248370) 2005 QN 173 (also
designated 433P) that demonstrate this recently discovered active asteroid (a body with a …

The peculiar object P/2010 A2 was discovered in January 2010 and given a cometary
designation because of the presence of a trail of material, although there was no central …