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Neutron Star Interior Composition Explorer
The ''Neutron star Interior Composition Explorer'' (''NICER'') is a future NASA Explorers program Mission of Opportunity dedicated to the study of the extraordinary gravitational, electromagnetic, and nuclear physics environments embodied by neutron stars, exploring the exotic states of matter where density and pressure are higher than in atomic nuclei. ''NICER'' will enable rotation-resolved spectroscopy of the thermal and non-thermal emissions of neutron stars in the soft (0.2–12 keV) X-ray band with unprecedented sensitivity, probing interior structure, the origins of dynamic phenomena, and the mechanisms that underlie the most powerful cosmic particle accelerators known. ''NICER'' will achieve these goals by deploying, following launch in December 2016, an X-ray timing and spectroscopy instrument as an attached payload aboard the International Space Station (ISS). ''NICER'' was selected by NASA to proceed to formulation phase in April 2013.
An enhancement to the ''NICER'' mission, the ''Station Explorer for X-ray Timing and Navigation Technology'' (''SEXTANT''), will act as a technology demonstrator for X-ray pulsar-based navigation (XNAV) techniques that may one day be used for deep-space navigation.
, ''NICER'' was on track for a 2016 launch, having passed its critical design review and resolved an issue with the power being supplied by the ISS. The mission is scheduled to launch with the SpaceX CRS-12 ISS resupply mission aboard a Falcon 9 rocket. The June 28, 2015, Falcon 9 launch failure affected the entire Falcon 9 manifest,〔(【引用サイトリンク】title=Launch Manifest )〕 making the ultimate launch date for ''NICER'' uncertain.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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