Science & InnovationReference Some of these cosmic collections are similar to the Milky Way, but some are quite different. Galaxies are sprawling space systems composed of dust, gas, and countless stars.
The discovery of many potentially habitable planets beyond the solar system and a growing understanding of the variety of life on Earth provides NASA an opportunity to advance the field of astrobiology,
The great cosmic abyss contains more that humanity can ever hope to see, including a slew of record-breaking objects. In our Solar System, Eris is the most distant known dwarf planet: over 90 AU away.