Comets are simplistically made of three components: The nucleus ... their nucleus sublimes – goes directly from solid to gas ...

Comet ATLAS (C/2024 G3) came three times closer to the sun than Mercury on January 13—and this may have changed it ...

Astronauts witnessed the brightest comet of 2025 from space as it streaked across the sky above Earth. "It is totally amazing to see a comet from orbit," NASA astronaut Don Pettit, who is ...