The planetary system we call home is located in an outer spiral arm of the Milky Way galaxy. Our solar system consists of our star, the Sun, and everything bound to it by gravity – the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune; dwarf planets such as Pluto; dozens of moons; and millions of asteroids, comets, and ...

The Sun is located in the Milky Way galaxy in a spiral arm called the Orion Spur that extends outward from the Sagittarius arm.

least twice as much mass in the Milky Way galactic disk as can be accounted for by adding up the mass of all stars and interstellar clouds. While the solar system does not have any detectable evidence for dark matter, our galaxy is composed of perhaps 90% dark matter.

arguments concerning the size of our own galaxy. Early scientists M5 Orbits the Milky Way questioned whether our galaxy was the universe, or just an undistinguished part of a larger system. In many ways, this debate has been going on for centuries. Is the Earth the only large object in the universe? Is the solar system the largest part of the ...

As the Earth journeys around the sun, the location of the sun-Earth libration points stays constant with respect to those two solar system objects, but moves from the perspective of a fictional observer hovering over the Milky Way galaxy in a spaceship.

Oct 31, 2010 · And the answer, published online today in the Astronomical Journal, is this: The rings are behaving like a miniature version of our own Milky Way galaxy. This new insight, garnered from images of Saturn's most massive ring, the B ring, may answer another long-standing question: What causes the bewildering variety of structures seen throughout ...

our galaxy, the Milky Way. The stars appear to be unevenly distributed. The National Science Standards call for learners to understand the nature of stars in our universe. Learners will discover that stars appear to be unevenly dispersed and have unequal brightness. But, as the distance from the observer to the stars increases, they appear to

NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.

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