| Ephemeris for Opportunity | |
| Encyclopedia Mythica Search for Opportunity | |
| JPL Small-Body Database Browser (may be naming citation info at bottom) for Opportunity | |
| Nasa Orbit Applet for Opportunity | |
| Wikipedia Search for Opportunity | |
| Google Search for Opportunity | |
| Biography Search for Opportunity | |
| Merriam Webster Search for Opportunity | |