ALMA 1.3 mm image showing the high-velocity 230 GHz CO emission from the explosive OMC1 outflow with ∼1″  (∼400 au) angular resolution. The maximum brightness temperatures in velocity channels covering the indicated velocity intervals are shown from ﹩{T}_{A}^{* }﹩ = 0 to 89 K on a linear scale. The current positions of BN, Source I, Source n, and IRc4 are indicated by red, blue, cyan, and magenta circles respectively. The vectors show the proper motions of BN (red), Source I (blue), and Source n (cyan) in the Orion Nebula Cluster reference frame Dzib et al. (2016). The dashed vectors show these motions in a frame in which the vector momenta sum to zero as described in the text. The lengths of the vectors correspond to the expected proper motions in 2000 years.