New and revised subject headings

Headings marked with an asterisk in the following list are existing allowed headings which have been updated with changes to references or notes. New headings are marked as N. Previously allowed headings which have become USE references are marked as U.

For full details of these headings, see the SCIS website at

A cumulative list of all new and revised subject headings approved since publication of SCIS Subject Headings Fifth Edition is also available at this site.

* Asteroids
* Astronomy
* Atmosphere
* Climate
N Climate change
N Dwarf planets
* Global warming
* Greenhouse effect
N Pluto (Dwarf planet)
* Satellites
* Solar system
N Southern United States
N Titan (Satellite)
U United States, South
U United States, West
N Western United States