<p>   The stationary Interior Exploration Using Seismic Investigations, Geodesy and Heat Transport (InSight) lander is scheduled to launch in March 2016 and land on Mars six months later.</p>  <p>   <img alt="" src="http://images.mid-day.com/2013/sep/mars_1.jpg" style="width: 500px; height: 292px;" /></p>  <p class="caption">   <strong><span style="font-size: 12px;">R</span></strong><strong style="font-size: 12px;">epresentational pic</strong></p>  <p class="caption">   u00a0</p>  <div id="cke_pastebin">   It will touch down at one of four sites selected in August from a field of 22 candidates. All four semi-finalist spots lie near each other on an equatorial plain in an area of Mars called Elysium Planitia.</div>  <div id="cke_pastebin">   u00a0</div>  <div id="cke_pastebin">   Scientists will focus two of NASA&rsquo;s Mars Reconnaissance Orbiter cameras on the semi-finalists in the coming months to gain data they will use to select the best of the four sites well before InSight is launched.</div>  <div id="cke_pastebin">   u00a0</div>  <div id="cke_pastebin">   The mission will investigate processes that formed and shaped Mars and will help scientists better understand the evolution of our inner solar system&rsquo;s rocky planets, including Earth.</div>  <div id="cke_pastebin">   u00a0</div>  <div id="cke_pastebin">   All four potential sites are an ellipse measuring 81 miles (130 kilometers) from east to west and 17 miles (27 kilometers) from north to south. Engineers calculate the spacecraft will have a 99-percent chance of landing within that ellipse, if targeted for the center.</div>  <div id="cke_pastebin">   u00a0</div>  <div id="cke_pastebin">   Elysium is one of three areas on Mars that meet two basic engineering constraints for InSight. One requirement is being close enough to the equator for the lander&rsquo;s solar array to have adequate power at all times of the year.</div>  <div id="cke_pastebin">   u00a0</div>  <div id="cke_pastebin">   Also, the elevation must be low enough to have sufficient atmosphere above the site for a safe landing. The spacecraft will use the atmosphere for deceleration during descent.</div>  <div id="cke_pastebin">   u00a0</div>  <div id="cke_pastebin">   InSight also needs penetrable ground, so it can deploy a heat-flow probe that will hammer itself 3 yards to 5 yards into the surface to monitor heat coming from the planet&rsquo;s interior.u00a0</div>  

NASA has narrowed the number of its potential landing sites for the space agency's 2016 Mars mission to four sites

NASA evaluates four potential landing sites for 2016 Mars mission

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NASA evaluates four potential landing sites for 2016 Mars mission

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