J. Zirker

Ever since Galileo glimpsed the moons of Jupiter through his tiny telescope, astronomers have striven to understand how the universe is constructed and how it evolves. Every increase in the size and p...

Jack Zirker takes us on an imaginary voyage from the center of the sun to its surface, showing us how sunlight is made and finally following the sun's energy to the far reaches of the solar system. Al...

One of the newest branches of astronomy, helioseismology - like its terrestrial counterpart - studies why the surface of the sun vibrates like a bell. Since the 1970s, astronomers have gained spectacu...