On
the 20th of August 1977, Voyager II was launched to be followed on
the 5th September by its twin, Voyager I. The reversed sequence of
launches was due to the different trajectories of the two craft as
they set off for the outer reaches of our solar system to explore
the gas and ice worlds of Jupiter, Saturn, Uranus and Neptune, taking
advantage of a once-in-175-years alignment of the planets The
pictures they sent back were astounding.
I've
just been watching again the Voyager programmes on the television and
marvelling at the engineers' ability to guide a tiny probe with about
as much computing power as a mobile phone, across billions of miles
and decades of time and to receive back these spectacular images as
well as all the scientific data.
The
Voyagers have now gone beyond the heliosphere, beyond the influence
of our sun and are travelling across the galaxy more than 20 billion
miles away and will probably continue to do so even after our sun and
its planets have ceased to exist.
In
the years between then and now, we have had the Viking Landers on
Mars, the red planet; the Mariner and Venera missions to Venus;
Galileo and Cassini to Jupiter and Saturn again, all adding to our
view of our solar system and its occupants.
Of
all the images the most powerful, to my mind, is that of the "pale
blue dot". As Voyager moved towards interstellar space, the
cameras were turned round to look back over nearly 4 billion miles
and there was this tiny speck.
This moved Carl Sagan to ask us
"to
preserve and cherish that pale blue dot, the only home we've ever
known."
The
news is of micro-plastics in the snows of Antarctic, of animal,
insect and plant species disappearing into extinction, and of global
warming and the ecological and social problems that will bring.
The
great Scots poet, Hugh Macdiarmid, showed remarkable prescience when
in 1925 he wrote The
Bonnie
Broukit Bairn.
Broukit, in Auld Scots, means neglected, begrimed. In 1925, it was
dirty with soot from coal. MacDiarmid couldn't have imagined the
levels of pollution we are now seeing.
Mars
is braw in cramassy*,
Venus
in a green silk goun
The
auld mune shak's her gowden** feathers
Their
starry talk's a wheen o' blethers,
Nane
for thee a thochty sparin'
Earth
thou bonnie broukit bairn
*crimson
** golden
Perhaps
now we will spare a thochty for the pale blue dot.