FIGURE 4.3 Earthrise from the Moon, as seen by the Apollo 8 crew. SOURCE: NASA.
FIGURE 4.4 Image of a new large and diffuse extragalactic object, Voorwerp, which is thought to be a gas cloud illuminated by a nearby active galactic nucleus discovered by Galaxy Zoo citizen scientist Hanny van Arkel. SOURCE: Dan Smith (Liverpool John Moores) and Peter Herbert (University of Hertfordshire). Image obtained using the Isaac Newton Telescope, Roque de los Muchachos, La Palma.