I have to disagree. There are observations that strongly suggest the existence of dark matter and dark energy is a solid inference to make - but the inferred DM and DE has not been directly observed. What is the DM? What is the DE? We would know if these entities of Lamda CDM cosmology were in fact observed.Originally Posted by korjik
Keep in mind that you have proposals for alternatives to DM such as MOND. Such alternatives would not get published in the journals if the DM was observed.