A <a href="https://en.wikipedia.org/wiki/Hydrogen" id="mwATU" rel="mw:WikiLink" title="Hydrogen">hydrogen</a> <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Celestial_body_atmosphere" id="mwATY" rel="mw:WikiLink" title="Celestial body atmosphere">atmosphere</a> is discovered on the <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Extrasolar_planet" id="mwATc" rel="mw:WikiLink" title="Extrasolar planet">extrasolar planet</a> <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Osiris_(planet)" id="mwATg" rel="mw:WikiLink" title="Osiris (planet)">Osiris</a> by the <a href="https://en.wikipedia.org/wiki/Hubble_Space_Telescope" id="mwATk" rel="mw:WikiLink" title="Hubble Space Telescope">Hubble Space Telescope</a>, the first atmosphere detected on an extrasolar planet.