Jupiter with comparison images of the Great Red Spot from 1995, 2009 and 2014
In this comparison image the photo at the top was taken by Hubble's Wide Field Planetary Camera 2 in 1995 and shows the spot at a diameter of just under 21 000km; the second down shows a 2009 WFC3 photo of the spot at a diameter of just under 18 000km; and the lowest shows the newest image from WFC3 taken in 2014 with the spot at its smallest yet, with a diameter of just 16 000km.
Image Credit: NASA, ESA, and A. Simon (Goddard Space Flight Center)
Science Credit: A. Simon (Goddard Space Flight Center), G. Orton (Jet Propulsion Laboratory), J. Rogers (University of Cambridge, UK), and M. Wong and I. de Pater (University of California, Berkeley)
Acknowledgment: H. Hammel (SSI and AURA) and R. Beebe (NMSU)