Particles surrounding a brown dwarf. Computer illustration showing cosmic dust particles in the disc around a brown dwarf. Rocky planets are thought to form through the random collision and sticking together of what are initially microscopic particles in the disc of material around a star. These tiny grains,known as cosmic dust,are similar to very fine soot or sand. Astronomers using the Atacama Large Millimetre/submillimeter Array (ALMA) have for the first time found that the outer region of a dusty disc encircling a brown dwarf a star-like object,but one too small to shine brightly like a star also contains millimetre-sized solid grains like those found in denser discs around newborn stars. This surprising finding challenges theories of how | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / L. Calcada (ESO) / NRAO) / NAOJ / ALMA (ESO |
Taille de l’image : | 3774 px × 2359 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
|