Explanation:

NASA’s Neutron star Interior Composition Explorer, or NICER, mission is an International Space Station payload that will provide high-precision measurements of neutron stars – objects containing ultra-dense matter at the threshold of collapse into black holes.
NICER will also test — for the first time in space — technology that relies on pulsars as navigation beacons. The technique may eventually guide human exploration to the distant reaches of the solar system and beyond.
It will also carry out the world’s first demonstration of X-ray navigation in space.
It was funded under the Missions of Opportunity (MO) program.
The mission will focus especially on pulsars. Pulsars and neutron Stars are the remnants of massive stars that, after exhausting their nuclear fuel, exploded and collapsed into super-dense spheres.
NICER launched June 3, 2017, from Cape Canaveral Air Force Station in Florida aboard the SpaceX-11 ISS Commercial Resupply Services flight. It was installed on the space station later that month.
Think – Recent missions by NASA

• NASA’s Lunar Reconnaissance Orbiter (LRO)
• K2 Mission
• Parker Solar Probe
• GOLD and ICON