<\/strong>or Listen by Using the Embedded Player Located at the Bottom<\/strong><\/p>\nHopefully, though, in the next five years, we\u2019ll know a lot more. That\u2019s when the Solar Orbiter is set to launch. A project of the European Space Agency, the Solar Orbiter will get closer to the sun than any satellite to date. <\/span>The journey to the sun will take years, even once the probe is built and launched.<\/span><\/p>\n“There are so many gaps in our knowledge of the sun. We’ve mapped practically every square mile of the planet Mars, we know more about Mars than the surface of the Earth in fact. But the sun constantly changes. It’s not made out of a solid surface at all. It’s made out of plasma, roughly 75 percent hydrogen and 25 percent helium. <\/em>That’s why this probe is so important — because it will travel inside the orbit of Mercury, where no other space probe has gone before.”
\n— Michio Kaku<\/em><\/span><\/span><\/strong><\/p>\n