This review addresses our current understanding of comets that venture close to the Sun,
and are hence exposed to much more extreme conditions than comets that are typically …

We use the C/N ratio as a monitor of the delivery of key ingredients of life to nascent
terrestrial worlds. Total elemental C and N contents, and their ratio, are examined for the …

Abstract The National Science Foundation's Daniel K. Inouye Solar Telescope (DKIST) will
revolutionize our ability to measure, understand, and model the basic physical processes …

Exocomets are small bodies releasing gas and dust which orbit stars other than the Sun.
Their existence was first inferred from the detection of variable absorption features in stellar …

Abstract Comet C/2013 US 10 (Catalina) was a dynamically new Oort cloud comet whose
apparition presented a favorable geometry for observations near close-Earth approach (≃ …

The estimate of the change rate of the solar gravitational parameter d (GM⊙)∕ dt is
obtained from processing modern positional observations of planets and spacecraft …

After the peak intensity of many large solar flares, magnetic and thermodynamic processes
give rise to a phenomenon known as supra-arcade downflows (SADs). SADs are sunward …

Extreme-ultraviolet images of Comet Lovejoy (C/2011 W3) from the Atmospheric Imaging
Assembly show striations related to the magnetic field structure in both open and closed …

NASA's Stardust mission returned rocky material from the coma of comet 81P/Wild 2
(pronounced “Vilt 2”) to Earth for laboratory study on January 15, 2006. Comet Wild 2 …

The present understanding of cometary atmospheres is based on Whipple's “dirty iceball”
idea in which the nucleus consists of a mixture of frozen volatiles and non‐volatile dust. The …