On November 5, 2018, NASA’s Voyager 2 joined its sister aircraft Voyager 1 beyond the heliosphere, ‘the protective bubble of particles and magnetic fields created by our Sun’.
Considered a ‘watershed moment in our exploration of space’,
five new research papers have been published in the journal Nature Astronomy
documenting what’s happened since the spacecraft crossed the boundary and raged
against the dying of the light.
As per NASA’s Jet Propulsion Laboratory, Voyager 2’s
findings will help ‘paint a picture of this cosmic shoreline, where the
environment created by our Sun ends and the vast ocean of interstellar space
begins’.
As told to IFLScience, NASA astrophysicist Jeffrey Hayes
said:
This is a watershed moment in our exploration of space: we
have for the first time left the confines of ‘home’ and are taking our very
first tentative steps into the interstellar space – the Milky Way galaxy of
which we are a part. That’s an amazing distance to come in only 62 years, since
the launch of the first satellite. Who knows what the next 62 will bring?
Each of the research papers revolves around the spacecraft’s
findings, compiled from its five operating instruments: a magnetic field
sensor, two instruments to detect energetic particles in different energy
ranges and two instruments for studying plasma (a gas composed of charged
particles).
But just what is the heliosphere? Hayes offered an
explanation, described it as a ‘somewhat porous boundary’.
Hayes added:
Inside is the space we live in, which is the much extended influence of the Sun and the solar wind that it generates, and outside is a region that is not under that same influence. Both Voyagers found this to be the case. The original model was that the solar wind would just gradually fade away until one was in the interstellar medium; clearly that’s not the case.
The heliopause acts as a somewhat porous boundary that only
allows some particles to traverse it. Because we have only very recently passed
through it – in 2012 with Voyager 1, and now with Voyager 2, there are still a
lot of aspects of this we don’t understand.
Discussing further exploration possibilities, Hayes added:
While the Voyager 2 has yet to enter undisturbed
interstellar space, the probes offer a groundbreaking illustration of how the
‘Sun interacts with the stuff that fills most of the space between stars in the
Milky Way galaxy’.
Discussing further exploration possibilities, Hayes added:
In terms of space exploration, it means that we have only
barely scratched the surface of what it means to be in interstellar space. All
told, we have entered a new era of exploration that is posing as many new
questions as it has answered our older ones.
Maybe it won’t be long until we send Matthew McConaughey
through a wormhole.
Reference(s): IFLScience