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Using Gaia DR2 astrometry, we map the kinematic signature of the Galacticstellar warp out to a distance of 7 kpc from the Sun. Combining Gaia DR2 and2MASS photometry, we identify, via a probabilistic approach, 599 494 upper mainsequence stars and 12 616 068 giants without the need for individual extinctionestimates. The spatial distribution of the upper main sequence stars clearlyshows segments of the nearest spiral arms. The large-scale kinematics of boththe upper main sequence and giant populations show a clear signature of thewarp of the Milky Way, apparent as a gradient of 5-6 km/s in the verticalvelocities from 8 to 14 kpc in Galactic radius. The presence of the signal inboth samples, which have different typical ages, suggests that the warp is agravitationally induced phenomenon.

The Galactic warp revealed by Gaia DR2 kinematics