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On this day in 1986 – January 24th – Voyager 2 flew past Uranus.

This fly-by was the first and only visit of a spacecraft to the ice giant Uranus.
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On this day in 1736 – January 25th – French-Italian mathematician Joseph Lagrange was born in Turin, Italy.

Lagrange was one of the great minds of the 18th century, and his work included major contributions to physics and astronomy. He's best known now for his identification of equilibrium points between the gravity of the Earth and that the Sun. NASA's SOHO (Solar and Heliospheric Observatory) sits at one of these points, and the James Webb Space Telescope at another.
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On this day in 1983 – January 25th – the Infrared Astronomical Satellite (IRAS) was launched.

IRAS, a joint project of NASA (USA), NIVR (Netherlands) and SERC (UK), was the first space telescope to carry out a survey of the whole night sky at infrared wavelengths.
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On this day in 1994 – January 25th – Clementine was launched.

Over a period of nearly four months, the US spacecraft Clementine made scientific observations of the Moon. In addition, the craft was used to test the effects on sensors and components of extended exposure to space.
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On this day in 2004 – January 25th – the Mars rover Opportunity landed on the red planet.

The mission was designed to last 90 Martian days, but it was operational until the summer of 2018 when an exceptionally severe dust storm blanketed Mars for three months. The rover didn't recover from the loss of power, and the mission was officially brought to an end in February 2019.
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On this day in 1978 – January 26th – the International Ultraviolet Explorer (IUE) was launched.

The IUE was a joint effort by the European Space Agency (ESA), the UK Science Research Council and NASA. It was switched off in 1996, after it had worked 14 years beyond its planned lifetime.
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On this day in 1829 – January 27th – pioneering astrophotographer Isaac Roberts was born in Groes Bach, Henllan, Denbighshire, Wales, UK.

Roberts was an amateur astronomer and a fellow of the Royal Geological Society. He developed a photographic technique which made it possible to capture faint objects. Roberts's photograph of the Andromeda Nebula actually showed the spiral structure of M31.
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On this day in 1941 – January 27th – New Zealand astrophysicist Beatrice Hill Tinsley was born in Chester, England.

Beatrice Tinsley began her career late, and died in 1981, but in the intervening years she revolutionized our view of galactic evolution. Her pioneering work continues to be regularly cited by researchers.
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On this day in 1967 – January 27th – the crew of Apollo 1, Virgil "Gus" Grissom, Edward White and Roger Chaffee, died when fire swept through the command module during a preflight test.

They are commemorated at the Astronaut Memorial at the Kennedy Space Center in Florida.
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On this day in 1611 – January 28th – Polish astronomer Johannes Hevelius was born in Danzig (Gdańsk), Poland.

Johannes Hevelius studied sunspots, produced a lunar chart, discovered several comets, and compiled an important star atlas. He was one of the most influential astronomers of the 17th century.
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