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The universe is the totality of space and time, all forms of matter, energy and momentum, laws and physical constants that govern them.
The Milky Way is a spiral galaxy that is found in the solar system and, therefore, the Earth. Based on observations, has a mass of 1012solar masses and is a barred spiral, with an average diameter of 100,000 light years, these are about 1000 billion km, is estimated to contain between 200 billion and 400 billion stars. The distance fromthe Sun to the center of the galaxy is about 27,700 years light (8,500pc, ie, 55 percent of the total galactic radius). The Milky Way is partof a group of about forty galaxies called the Local Group, and is the second biggest and brightest after the Andromeda Galaxy (although it may be the more massive, a recent study showing that our galaxy is 50% more massive than previously believed.
The solar system is a planetary system of the Milky Way that is in one arm of it, known as the Orion Arm. According to recent estimates, thesystem is about 28 thousand light years from the center of the Milky Way.It consists of a single star called Sol, which gives this system, plus eight planets orbiting the star: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune, plus a host of other minor bodies: dwarf planets (Pluto, Eris, Makemake, Haumea and Ceres), asteroids,moons, comets, andinterplanetary space between them.
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The Milky Way is a spiral galaxy that is found in the solar system and, therefore, the Earth. Based on observations, has a mass of 1012solar masses and is a barred spiral, with an average diameter of 100,000 light years, these are about 1000 billion km, is estimated to contain between 200 billion and 400 billion stars. The distance fromthe Sun to the center of the galaxy is about 27,700 years light (8,500pc, ie, 55 percent of the total galactic radius). The Milky Way is partof a group of about forty galaxies called the Local Group, and is the second biggest and brightest after the Andromeda Galaxy (although it may be the more massive, a recent study showing that our galaxy is 50% more massive than previously believed.
The solar system is a planetary system of the Milky Way that is in one arm of it, known as the Orion Arm. According to recent estimates, thesystem is about 28 thousand light years from the center of the Milky Way.It consists of a single star called Sol, which gives this system, plus eight planets orbiting the star: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune, plus a host of other minor bodies: dwarf planets (Pluto, Eris, Makemake, Haumea and Ceres), asteroids,moons, comets, andinterplanetary space between them.
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