Transit-Timing Variation (TTV) 3D Explorer vs Exoplanet Transit 3D Explorer
freetoolonline.com editorial teamBoth pages render real exoplanet-detection science in one page load - 0 MB installed, USD 0, no account. The Transit-Timing Variation (TTV) 3D Explorer covers the INDIRECT signal that can reveal a planet no one has ever seen transit; the Exoplanet Transit 3D Explorer covers the DIRECT brightness dip a single transiting planet produces by itself.
The numbers side by side
| Aspect | TTV Explorer | Exoplanet Transit Explorer |
|---|---|---|
| Install size | 0 MB - runs in the browser | 0 MB - runs in the browser |
| Price | USD 0 | USD 0 |
| Signal type | Indirect - a timing wobble caused by a second, often unseen planet | Direct - the brightness dip one planet causes crossing its own star |
| Real systems shown | Kepler-19b+19c, Kepler-9b+9c, Kepler-36b+36c | Jupiter-Sun and Earth-Sun depth analogs, TRAPPIST-1 note |
| What it can find | A planet that has never once been observed transiting - Kepler-19c is the proof case | Only planets whose own orbital plane crosses the star as seen from Earth |
| Interaction | Pick a system, scrub or play 40 transits, reveal the hidden planet | Pick Jupiter or Earth depth, scrub orbit phase, toggle the TRAPPIST-1 note |
Where the Exoplanet Transit Explorer wins
The Exoplanet Transit Explorer wins when the question is what a transit itself actually looks like and why its depth follows (Rplanet/Rstar) squared - it is the direct, single-planet signal every transit-timing analysis starts from.
Where the TTV Explorer wins
The TTV Explorer wins when the question is how astronomers find planets that transits alone cannot reveal - it is the only page on the site visualizing the timing-wobble detective work behind a planet like Kepler-19c that has never once been seen crossing its own star.
A reasonable rule
As a reasonable rule, use the Exoplanet Transit Explorer first to see what a single transit's brightness dip looks like, then use the TTV Explorer to see how a second planet's gravity leaves its own, indirect signature in that transit's timing.
See how to use the Transit-Timing Variation (TTV) 3D Explorer for a step-by-step walkthrough.
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