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On this day in 1914 – June 26th – American theoretical physicist and astronomer Lyman Spitzer, Jr. was born.

His major contributions to astronomy included his studies of star formation and the interstellar medium. The Spitzer Space Telescope is named in his honor.

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On this day in 1912 – June 28th – Australian radio astronomer Ruby Payne-Scott was born.

Payne-Scott was a pioneer in radiophysics and radio astronomy, and was the first female radio astronomer.

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On this day in 1868 – June 29th – American solar astronomer George Ellery Hale was born.

Hale was a key figure in the creation of three telescopes, each of which was the biggest in the world at the time of construction: the 40-inch refractor at Yerkes Observatory, the 60-inch Hale reflector at Mt Wilson and the 200-inch Hale reflector at Palomar Observatory.


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On this day in 1995 – June 29th – the first docking between the Soviet space station Mir and the American Space Shuttle took place.

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On this day in 1908 – June 30th – an asteroid impact leveled hundreds of miles of Siberian forest around Tunguska.

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On this day in 2001 – June 30th – the Wilkinson Microwave Anistotropy Probe (WMAP) was launched.

This spacecraft operated from 2001 to 2010. Across the sky it measured tiny temperature differences in the cosmic microwave background (CMB) - the radiant heat left over from the Big Bang.

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On this day in 1990 – June 30th – the joint ESA/NASA Ulysses mission came to an end after 18 years in service.

Ulysses was the first ever spacecraft to explore space above and below the Sun's poles. When it was launched it had a nominal lifetime of five years.

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On this day in 1917 – July 1st – the 100" mirror for the Hooker telescope arrived at Mt Wilson Observatory.

This telescope was the biggest in the world for three decades. Edwin Hubble calculated the distance to Andromeda from a Cepheid variable he discovered there with the telescope. It showed Andromeda was a separate galaxy. Hubble and Humason also observed the redshifts of a number of galaxies and found that they were moving away from us.

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On this day in 1985 – July 2nd – the European Space Agency (ESA) launched the Giotto probe to study Halley's Comet.

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On this day in 1935 – July 3rd – geologist and Apollo 17 astronaut Harrison Schmitt was born.

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