TheUniverseis all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy. ... At the largest scale, galaxies are distributed uniformly and the same in all directions, meaning that theUniversehas neither an edge nor a center.Ans 2. Agalaxyis a huge collection of gas, dust, and billions of stars and their solar systems. Agalaxyis held together by gravity. Ourgalaxy, the Milky Way, also has a supermassive black hole in the middle. ... Some scientists think there could be as many as one hundred billiongalaxiesin the universe.Ans 3. In our solar system, theplanets orbit around the Sunin a elliptical path. An "ellipse" looks like a circle that has been stretched. Gravity, a force in the universe, keeps theplanetsand other objects in space on their paths (or orbits).Ans 4. The Solar System is the gravitationally bound system of the Sun and the objects that orbit it, either directly or indirectly. Of the objects that orbit the Sun directly, the largest are the eight planets, with the remainder being smaller objects, such as the five dwarf planets and small Solar System bodies.Ans 5. Starsare the astronomical objects, that emit their own light, produced due to thermonuclear fusion, occurring at its core.Planetsrefers to the celestial object that has a fixed path (orbit), in which it moves around thestar. ... There is only onestarin the solar system. There are eightplanetsin our solar system.

2= A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The word galaxy is derived from the Greek galaxias, literally "milky", a reference to the Milky Way

3, answersall planets revolve around the sun

1. GALAXY Agalaxyis a group of many stars, with gas, dust, and dark matter. The name 'galaxy' is taken from the Greekwordgalaxia meaning milky, a reference to our owngalaxy, the Milky Way. Gravity holdsgalaxiestogether against the general expansion of the universe. 2. the Mercury , Venus , Earth , Mars , Jupiter , Saturn , Uranus , Neptune , Pluto3.SOLAR SYSTEM TheSolar Systemis the Sun and all the objects that orbit around it. The Sun is orbited by planets, asteroids, comets and other things. TheSolar Systemis about 4.6 billion years old. It formed by gravity in a large molecular cloud.