NASA's Space Launch System (SLS) has been having some problems getting tested since it rolled out onto launch pad 39B last month. These tests, called wet dress rehearsals, are used to find any problems with loading the propellant and verify that all of the rocket's systems are able to handle it being exposed to cryogenics.

After this most recent attempt on April 14th, it is clear that the SLS isn't ready for flight yet. The problems that the teams have been encountering have led them to make some procedural changes and slight adjustments in operations and software triggers. There are also the leak problems that have shown up that have to be addressed.

An atmospheric environment monitoring satellite was sent into space by the Long March-4C rocket lifting off from the Taiyuan Satellite Launch Center in Shanxi Province, north China early Saturday.

Five atmospheric environment monitoring payloads are carried on the satellite orbiting the Earth, three of which are developed by the Hefei Institutes of Physical Sciences (HFIPS) of the Chinese Academy of Sciences, namely environmental Monitoring Instrument (EMI), Directional Polarization Camera (DPC) and Particle Observation scanning Polarization Meter (POSP), working independently or collectively to monitor the air pollutants at global scale.

With a maximum field of view of 2,600 kilometers, it can cover the entire earth in one day and has a minimum spectral resolution of 0.6 nanometer, enabling EMI to accurately identify unique information in the absorption spectra and then detect and monitor polluted gases such as nitrogen dioxide, sulfur dioxide and formaldehyde.

For DPC and POSP, researchers at HFIPS proposed an innovative detection program called "Crossfire," which combines the spatio-temporal distribution of global atmospheric aerosols and clouds obtained by DPC instrument and the high-precision atmospheric aerosol parameters obtained by the POSP instrument across orbit.