Japan's space agency has said its Hayabusa2 spacecraft released an explosive onto an asteroid to make a crater on its surface and collect underground samples to find possible clues to the origin of the solar system.&nbsp;<br />”<br />”The Japan Aerospace Exploration Agency (JAXA), said in Tokyo that Hayabusa2 dropped a &quot;small carry-on impactor&quot; made of copper onto the asteroid and safely evacuated and remained intact. JAXA is analyzing further details. <br />”<br />”<span style="color: #222222;">Hayabusa2 successfully touched down on a tiny flat surface on the boulder-rich asteroid in February, when the spacecraft also collected some surface dust and small debris.</span><br />