an asteroid
... that in 2018, an asteroid measuring 12 meters (39 feet) across exploded in an air burst over the Bering Sea near the Kamchatka Peninsula with the force of 173 kilotons of TNT?
... that in 2018, <b id="mwAXo"><a href="./Kamchatka_meteor" id="mwAXs" rel="mw:WikiLink" title="Kamchatka meteor">an asteroid</a></b> measuring 12 meters (39 feet) across exploded in an <a href="./Air_burst" id="mwAXw" rel="mw:WikiLink" title="Air burst">air burst</a> over the <a href="./Bering_Sea" id="mwAX0" rel="mw:WikiLink" title="Bering Sea">Bering Sea</a> near the <a href="./Kamchatka_Peninsula" id="mwAX4" rel="mw:WikiLink" title="Kamchatka Peninsula">Kamchatka Peninsula</a> with the force of 173 <a href="./TNT_equivalent" id="mwAX8" rel="mw:WikiLink" title="TNT equivalent">kilotons of TNT</a>?