Executive Orders are controversial because they allow the President to make major decisions, even law, without the consent of Congress. This, of course, runs against the general logic of the Constitution -- that no one should have power to act unilaterally.
Voyager 1 has since become the fastest and most distant man-made object in the Universe, travelling at around 61,500km/h at a distance of 17.6 billion km from the Earth. Perhaps most incredible of all, NASA is still in communication with it, despite radio signals taking 16 hours to reach it. Image Â© NASA.
Voyager 1 is travelling at 17 km/s and the 3 RTG's that power Voyager 1 are expected to last until 2025. RTG power plants are designed to last for decades, but once the 238Pu isotopes that power the RTG reach half life power production drops by about half of what the output was when the RTG was activated.