24.uranus
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Voyager 2 made flybys of Uranus in 1986 and Neptune in 1989, capturing the first close-up images of both planets and their moons. It found that Uranus has a unique axial tilt of 98 degrees, likely caused by a large impact in the past. Voyager imaged Uranus' system of rings in detail for the first time and discovered over 20 moons, including Miranda which shows evidence of splitting apart and reassembling. It made similar discoveries at Neptune, greatly advancing our understanding of the ice giant planets.
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- 1. Voyager 2 encounters with Uranus and Neptune August 25th, 1989 January 24th, 1986 August 25th, 1989
- 2. The English astronomer, William Herschel, discovered Uranus in 1781
- 3. McDonald Observatory image of Uranus and some of its moons
- 5. Uranus is the only planet whose axis of rotation lies in its orbital plane (tilt of 98属), probably caused by a large impact.
- 6. Comparison of the densities and compositions of the Jovian planets
- 7. Interior Structure of Uranus and Neptune *
- 8. Approach of Viking 2 on July 15, 1985 of Uranus and 4 of its moons (composite).
- 9. False color (left) and true color images of Uranus, taken by Viking 2
- 10. The ring system of Uranus
- 11. Some of the rings of Uranus, discovered by the Viking spacecraft
- 12. Rings of the planet Uranus, with two shepherd moons which keep the ring particles in place, discovered by the Viking spacecraft
- 13. Continuous distribution of small particles throughout the ring system of Uranus. Picture taken while the Viking spacecraft was in the shadow of Uranus. These dust lanes were previously unknown. 96 second exposure, hence, background stars form streaks.
- 14. Epsilon ring of Uranus, and three of the moons discovered by the Viking spacecraft
- 15. Size comparison of the larger moons of Uranus
- 16. Miranda, ~468 km in diameter
- 17. 5 km high scarp on Miranda Miranda may have split apart and reassembled
- 19. 50 km wide chevron on Miranda indicates complex history
- 20. Ariel 1,160 km in diameter; shows many tectonic features
- 21. Umbriel - 1,168 km in diameter Resolution of this Viking image is ~ 10 km. Umbriel is highly cratered, particularly on its southern hemisphere (right). It is the darkest moon of Uranus, with an albedo of ~ 16 %, like our moon. It also is the moon with lowest internally- generated geologic activity. The bright spot at the top of the image (near the equator) may be frost.
- 22. Titania 1,580 in diameter; heavily cratered but also has long scarps
- 23. Oberon 1,520 km in diameter; bright surface markings, many impact craters