The ultrahighly nanoporous aerogel is recognized as a state of matter rather than as a
functional material, because of its qualitative differences in bulk properties, transitional …

Aerogels are highly porous structures prepared via a sol‐gel process and supercritical
drying technology. Among the classes of aerogels, silica aerogel exhibits the most …

Cometary ices are rich in CO2, CO and organic volatile compounds, but the carbon content
of cometary dust was only measured for the Oort Cloud comet 1P/Halley, during its flyby in …

The Philae lander provides a unique opportunity to investigate the internal structure of a
comet nucleus, providing information about its formation and evolution in the early solar …

The bulk of the comet 81P/Wild 2 (hereafter Wild 2) samples returned to Earth by the
Stardust spacecraft appear to be weakly constructed mixtures of nanometer-scale grains …

Comets are thought to preserve almost pristine dust particles, thus providing a unique
sample of the properties of the early solar nebula. The microscopic properties of this dust …

We present evidence that in~ 1650 BCE (~ 3600 years ago), a cosmic airburst destroyed
Tall el-Hammam, a Middle-Bronze-Age city in the southern Jordan Valley northeast of the …

We report the relative abundances of 17 elements in the atmosphere of the white dwarf star
GD 362, material that, very probably, was contained previously in a large asteroid or …

This review presents our understanding of cometary dust at the end of 2017. For decades,
insight about the dust ejected by nuclei of comets had stemmed from remote observations …

Particles emanating from comet 81P/Wild 2 collided with the Stardust spacecraft at 6.1
kilometers per second, producing hypervelocity impact features on the collector surfaces that …