Heliosphere Gas Clouds Charged Particles Molecular Clouds Heliopause Chemical Enrichment Light Echoes Hydrogen and Oxygen Gas Phases Gas Cooling Processes Giant Stars Cosmic Observations Plasma Physics Gas and Dust Cosmic Environment Dust and Gas Clouds Binary Star Systems Dust Grains Particle Physics Cosmic Phenomena Dust in Space Stellar Winds Epoch of Reionization Dust Dust Clouds Voyager 2 Solar Wind Cosmic Rays
Isotopic fingerprints indicate the disk’s water formed in frigid molecular clouds long before the star.