When the search for habitable exoplanets requires a 1,000 times more stable telescope than James Webb Space Telescope, even minimal material expansion down to a fraction of the width of an atom is the ...

Most materials expand when they are heated, but some contract instead. A record value of this effect — known as negative thermal expansion — has now been observed in magnetic nanocrystals. Controlling ...

Materials expand when heated and contract when cooled because of temperature-induced changes in distances between molecules and atoms. Thermal expansion does not change overall structure of the ...