From the Official Google Blog:
Today, we are introducing Google Earth VR as our next step to help the world see the world. With Earth VR, you can fly over a city, stand at the top of the highest peaks, and even soar into space.
You can download Google Earth VR today in the Steam Store for free. Like Tilt Brush, Earth VR is launching first on the HTC Vive. Stay tuned for more updates on Google Earth across other platforms next year.