The American <a href="https://en.wikipedia.org/wiki/Galileo_(spacecraft)" id="mwAQc" rel="mw:WikiLink" title="Galileo (spacecraft)"><i id="mwAQg">Galileo</i> spacecraft</a> makes its closest approach to <a href="https://en.wikipedia.org/wiki/951_Gaspra" id="mwAQk" rel="mw:WikiLink" title="951 Gaspra">951 Gaspra</a>, becoming the first probe to visit an <a href="https://en.wikipedia.org/wiki/Asteroid" id="mwAQo" rel="mw:WikiLink" title="Asteroid">asteroid</a>.