Contents

2 No Mission is an Island  
2.1 SPHEREx in Context  
2.2 SPHEREx and The Decade of Surveys  

3 2MASS and WISE  

4 JWST  
4.1 Discovery Space  
4.2 Characterizing galaxies over time  
4.4 Dust Around Main Sequence Stars  
4.5 Interstellar Ices  

5 Euclid, WFIRST, and LSST  
5.1 The Distribution of Galaxies in Space and Time  
5.2 Overlapping Deep Fields  

5.4 Cosmology with Cosmic Voids  
5.5 Exploiting Euclid-SPHEREx Complementarity for Primordial Non-Gaussianity Constraints  
5.6 Comets and Asteroids  

6 LUCY and the Trojan & Greek Asteroid Survey  

7 TESS and Gaia  
7.1 Improved Knowledge of Exoplanet Host Stars and Exoplanet Properties  
7.2 Stellar Astronomy  

8 eROSITA and Clusters of Galaxies  
8.1 Clusters of Galaxies  

9 ALMA  

10 SOFIA  

11 Large-Scale Ground-based Integral Field Spectroscopy Surveys  
11.1 A New Generation of Integral Field Spectroscopy Surveys  
11.2 Spectrally Mapping Nearby Galaxies  

12 SPHEREx Observation of the Interstellar Medium at High Redshift  
12.1 ISM Masses at High Redshift  

13 Cross-Correlations with the Kinematic Sunyaev-Zel’dovich Effect  

14 Novel Scientific Opportunities Enabled by SPHEREx  
14.1 Other Probes of Primordial Non-Gaussianity with Unbiased Tracers  
14.2 Probing the Three Phases of Hydrogen with SPHEREx at High Redshift  

15 Conclusion