1. GALEX: Galaxy Evolution Explorer
By: Jessica Hauss

2. GALEX

5. What is GALEX?
A small explorer class mission under NASA’s Structure and Evolution of the Universe Division
Led by California Institute of Technology

6. Scientific Goals
Understand the evolution of star formation in galaxies from the early universe to the present.
Compare near-by galaxies to older galaxies in order to better understand how galaxies evolve.
Map a large section of the Universe

7. Three Basic Properties
1. Speed of light
2. Distribution of galaxies
The expansion of the Universe

8. Spectrum

9. UV light

10. Galaxies
Spiral
M74
Elliptical
- M87
Irregular
IC10

11. What we learn from UV light?
Star formation rates
Distance
Shape of galaxy
Gas content
How galaxies cluster
How these change with time

12. Surveys All-Sky Imaging Survey Deep Sky Imaging
A unique ultraviolet map of the entire sky
Deep Sky Imaging
A measure of the ultraviolet light from galaxies more than 80% of the way back to the beginning.
A Survey of the 200 closest galaxies in ultraviolet.

13. Spectroscopic Surveys
Wide-field Spectroscopic Survey
Shows how UV emission is related to star formation rates and how much gas and dust is present.
Medium-deep Spectroscopic Survey
Shows nearby star-forming galaxies so we can compare them to older galaxies.
Deep Spectroscopic Survey
Show the faintest galaxies with the least star formation.

17. Cartwheel Galaxy

18. Cartwheel Galaxy

19. Cartwheel Galaxy

20. Cartwheel Galaxy

21. Cartwheel Galaxy

23. Thanks…