Hohlraum Cover (IMAGE) University of Rochester Caption To study the pressures created by white dwarf stars, researchers fired nanometer laser light into a hohlraum--a tiny gold cylinder--bathing a 1 mm sample of a carbon-based compound in radiation heated to nearly 3.5 million degrees, at pressures ranging from 100 to 450 million atmospheres. Credit Illustration by Mark Meamber/Lawrence Livermore National Laboratory Usage Restrictions Credit Mark Meamber/Lawrence Livermore National Laboratory License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.