On March 13th
1930 the announcement of a new planet was made, Pluto became the
ninth planet of the solar system.
The
search for the planet stared after the discovery of the planet
Neptune in 1846. After about 40 years it appeared as if something was
gravitationally pulling or slightly tugging on Neptune hence the
search.
It
was discovered at Flagstaff observatory I America which had been
constructed in 1896 by Percival Lowell to look for this new planet.
Lowell would die in 1916 so would not see the discovery. The search
continued after his death and in 1925 another smaller observatory was
built at Flagstaff. Today this is known as the Pluto discovery
observatory.
In
1929 a young astronomer called Clyde Tombaugh was tasked with looking
for this new planet. On January 23rd
and 29th
1930 photographs were taken that suggested that something had been
discovered. It was not until March 13th
1930 that the discovery was confirmed. At the time of its discovery
Pluto was in the constellation of Gemini the Twins.
The
name for the new planet was suggested not by an astronomer but by an
11 year old girl from England, Venetia Burney. She thought that Pluto
was a good name as the planet was so far from the Sun and that Pluto
was the god of darkness, it seemed very apt.
Since
its discovery Pluto had set astronomers with many problems, it is
very small and even Clyde Tombaugh was not convinced it was a planet.
When looking for this new planet it appears that Pluto just happened
to be in the right place but was not the object astronomers were
looking for.
Pluto,
is so from the Sun that it takes over 247 years to orbit the Sun
once. It is so small that not even the Hubble Space Telescope could
tell astronomers much about this distant world.
In
2003 an object called Eris was discovered which was also a very long
way from the Sun. Eris was roughly the same size as Pluto and was
classified as a dwarf planet. This meant that in 2006 astronomers
decided that Pluto should be downgraded from a planet to a dwarf
planet.
In
2015 the New Horizons space craft flew by Pluto and revealed a very
amazing and bizarre world. It was nothing like what astronomers had
imagined.
Is
there a planet 9 waiting to be discovered out there somewhere far
beyond Pluto? Some astronomers suspect there is.
www.theramblingastronomer.co.uk