But we shall see if it holds up to the scrutiny of the scientific community over the next weeks and months. I'm sure that the authors of the paper have been exceedingly careful.
More evidence is needed.
M ars' orbit is significantly elliptical. One result of this is a temperature variation of about 30 C at the subsolar point between aphelion and perihelion. This has a major influence on Mars' climate . T hough Mars is much smaller than Earth, its surface area is about the same as the land surface area of Earth. Much of the Martian surface is very old and cratered, but there are also much younger rift valleys, ridges, hills and plains.