Accelerated tests of solid or self-lubricating bearings are already supported by considerable tribometer data  as summarized here. However, at bearing level, life data is much more scarce and there is a much larger  spread of results. Better controlled and instrumented tests, such as those proposed for the ABTR are  needed in order to reduce the spread so that existing regressions may be refined into still more credible  and useful life estimation tools.    Acknowledgements  Much of the work presented was made possible by the financial support of the European Space Agency  through its ESTEC technical center, whose leading role in directing and furthering the understanding of  space tribological issues is gratefully acknowledged.   References  1. Meeks, C.R., Christy, R.I., Cunningham, A.C., “Accelerated Vacuum testing of Long Life Ball Bearings and Slip Rings”, Proc. 5th Aerospace Mechanisms Symposium, NASA-SP-282, (1970) 2. Ward, W.E and Benzing, R.J.,"Approaches to the accelerated life-testing of lubricants for space“, Proc. 1st European Space Tribology Symposium , ESA-SP111 (1975) 3. Murray, S.F., Heshmat, H. & Fusaro, R., “Accelerated Testing of Space Mechanisms” MTI Report 95TR29 for NASA  (April 1995) 4. Hamrock, B. J. and Dowson, D., “Ball Bearing Lubrication”, New York, Wiley (1981) 5. Lewis, S.D. “Accelerated Testing of Liquid Lubricated Spacecraft Mechanisms”, Proc. 7th European Space Mechanisms and Tribology Symposium (ESMATS), Noordwijk, ESA – SP113 (1997) 6. Mia, S., Komiya, H., Hayashi, S., Morita, S., Ohno, N., Obara, S., “Viscosity Loss in PFPE Lubricant for Space Applications under EHL Conditions”, Tribology Online  2, 54–58 (1997). 7. Ohno, N., Mia, S., Morita, S., Obara, S., “Friction and Wear Characteristics of Advanced Space Lubricants.”, Tribology Transactions  53, 249–255 (2010). 8. Nakamura, Y., Yukawa, T., Kubo, S., Matsui, M., “Rheological Evaluations of Solidified Lubricating Greases and Their Base Oils under Very High Pressure”, Tribology Online  8, 303–307 (2013). 9. Vergne, P., Bair, S., “Classical EHL Versus Quantitative EHL: A Perspective Part I—Real ViscosityPressure Dependence and the Viscosity-Pressure Coefficient for Predicting Film Thickness”, Tribology Letters  54,1–12 (2014) 10. Bair, S., Martinie, L., Vergne, P., “Classical EHL Versus Quantitative EHL: A Perspective Part II— Super-Arrhenius Piezoviscosity, an Essential Component of Elastohydrodynamic Friction Missing from Classical EHL”, Tribology Letters  63, (2016). 11. Stanley, S., Hampson, M., “An Experimental Assessment of the Evaporation Lives of Space Oils”, ESA-ESTL-TM-0162 01- (2018) 12. Kent, A., “Long Term Storage and Cage Impregnation”, ESA-ESTL-TM-0181 01- (2018) 13. Kent, A., “Life of Space Greases in Air” ESA-ESTL-TM-0190 01- (2016) 14. Buttery, M., “Further SOT Studies of Fluid Lubrication - Phase 1”, ESA-ESTL-TM-0158 01- (2018) 15. Kingsbury, E., “Parched Elastohydrodynamic Lubrication” ASME J. Tribology  107(2), 229-232 (1985). 16. Cousseau, T., Graca, B., Campos, A., Seabra, J., “Grease Aging Effects on Film Formation Under Fully Flooded and Starved Lubrication”, Lubricants  3,197-221 (2015). 17. ESTL Space Tribology Handbook, 5th Edition v2 (2013) 18. Wardzinski, B., “Life vs Contact stress for Dry Lubricated Gear Steels”, ESA-ESTL-TM-0101 01- (2014) 19. Vortselas, A., “Preliminary Evaluation of Solid, Fluid and Hybrid Lubricated Gears”, ESA-ESTL-TM0202 01- (2018 in prep.) 20. Buttery, M., “An Evaluation of Liquid, Solid, and Grease Lubricants for Space Mechanisms Using a Spiral Orbit Tribometer”, Proc. 40th Aerospace Mechanisms Symposium , NASA Kennedy Space Center. NASA/CP-2010-216272 (2010) 21. Buttery, M., “Spiral Orbit Tribometer Assessment of Space Lubricants”, ESA-ESTL-TM-066 01- (2010) 22. Buttery, M., Kent, A., Forster, D., Vortselas, A., “Hybrid Lubrication of PFPE Fluids and Sputtered MoS 2”, Proc. 44th Aerospace Mechanisms Symposium, NASA Glenn Research Center (2018). NASA/CP—2018-219887 526