The Prediction Markets

Pluto reclassified as a planet by June 30?

Closed
Jun 30, 2026
Traded
$31K
Venues
Polymarket
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This market has closed

Trading ended on Jun 30, 2026. The prices below are the last ones before it closed and no longer update. Browse open markets

Odds by venue

Fair chance strips out each venue’s built-in margin (its prices add up to more than 100%), then blends the venues by how much has traded there, so the outcomes add up to 100%. Best Yes price is the cheapest ask across venues, and the payout is what a winning $100 stake returns before fees. Open a row for each venue’s contract name, bid and ask, and how closely their rules match.

Prices come from our regular polls of each venue, the oldest 125 days ago. Ages are as of when this page was built.

  • Polymarket
Yes
0.7%
Polymarket 0.7%polled, 3016 h agoBest Yes 1¢ on Polymarket, $100 pays $10,000 (100x)
Polymarket
Contract
Yes
Last price
0.7%
As of
Polled 125 d ago
Buy Yes
1¢
Sell Yes
0.4¢
$100 on Yes pays
$10,000 (100x)
Volume
$31K
Trade this on Polymarket

Who resolves this market

Polymarket
Polymarket resolves via:
UMA optimistic oracle

How the odds have moved

The leading outcome on both venues, with the consensus between them. Hover for exact values.

  • Yes

Order books

Each venue’s resting orders for the Yes contract, side by side. Top of book streams live; depth refreshes every 15 seconds.

Polymarket

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Top of book

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Depth · top 8 levels

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Recent trades

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What your stake buys

Enter a stake to see where it buys the most after fees, using each venue’s live order book.

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Cover Yes and No across venues

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Buys at the asks resting now (taker orders), cheapest after fees first, from order-book snapshots up to 15 seconds old. Fees: Kalshi 0.07 × price × (1 − price) per share, rounded up to the cent; Polymarket 0.05 × price × (1 − price) per share (other / general rate). Fee calculator. Estimates only, not advice.

About this market

Final prediction market prices for "Pluto reclassified as a planet by June 30?". Yes last traded at 0.7%. $31K has traded across 1 outcome on Polymarket. The market closed on Jun 30, 2026.

Pluto is currently classified as a dwarf planet by the International Astronomical Union. NASA administrator Jared Isaacman has urged Donald Trump to declare Pluto a planet again. This market will resolve to "Yes" if Pluto is declared a planet by June 30, 2026, 11:59PM ET. Otherwise, this market will resolve to "No". A qualifying declaration may be made by the International Astronomical Union or by Donald Trump, but must explicitly state that Pluto's status is that of a planet. Statements reinforcing Pluto's dwarf planet status or statements indicating that its classification may be reconsidered will not be sufficient to qualify this market towards a "Yes" resolution. Statements indicating intent to reclassify Pluto as a planet will count towards this market's resolution only if they are made without qualifiers (e.g., "Pluto will be reclassified as a planet if it sufficiently clears its orbit" would not count). Executive orders declaring Pluto's status as a planet will qualify. This market's resolution source will be statements from the International Astronomical Union, Donald Trump, or any official White House legal or social media representative will qualify.

Questions

What does the consensus price mean?

It is the price of a Yes contract that pays $1 if the outcome happens. A 14¢ price means traders put the chance near 14%. Where two venues list the same outcome, we blend their last prices, weighting the venue with more trading volume more heavily (neither counts for less than a quarter). When only one outcome can win, each venue’s prices add up to a little over 100% (its margin); the fair chance removes that margin so the outcomes add up to exactly 100%.

How is the payout worked out?

A Yes contract pays $1 if it wins, so at the best ask a $100 stake buys 100 ÷ ask contracts. At 18¢ that is about 555 contracts, paying $556 (5.56x) if Yes happens. Venue fees and price slippage on larger orders are not included.

Why do the venues show different prices?

Each venue has its own traders, fees and order book. Contracts can also settle on slightly different terms, which is why each row lists how closely the rules match.

Is a price gap an arbitrage?

Only when you can buy Yes on one venue below what someone pays for Yes on the other, after fees, and both contracts settle the same way. We show the executable bid and ask so you can check.

How fresh are these prices?

Venue prices refresh every few minutes, and the order book and live quotes stream continuously. Each venue’s card shows when we last observed it.

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