Title: Relativistic Astronomy,
Abstract: The "Breakthrough Starshot" aims at sending near-speed-of-light cameras to
nearby stellar systems in the future. Due to the relativistic effects, a
trans-relativistic camera naturally serves as a spectrograph, a lens, and a
wide-field camera. We demonstrate this through a simulation of the optical-band
image of the nearby galaxy M51 in the rest frame of the trans-relativistic
camera. We suggest that observing celestial objects using a trans-relativistic
camera may allow one to study the astronomical objects in a special way, and to
perform unique tests on the principles of special relativity. We outline
several examples that trans-relativistic cameras may make important
contributions to astrophysics and suggest that the Breakthrough Starshot
cameras may be launched in any direction to serve as a unique astronomical
observatory.