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In fact, the sun is not massive. It is an average, yellow star. When the sun goes into its next stage, it becomes a red giant. This could consume the whole solar system. Then, when it burns out, the gases escape into space, and it becomes a little tiny star called a white dwarf. Eventually it will burn out, and that's how the sun's lifecycle works.
There are two tools that astronomers use to determine that a far-off star has planets. 1. Occultation: When a planet passes in between the Earth and another star, it is called an "occultation", from the Latin word "occult" or "hidden". The light measurement from the star will be slightly decreased when a planet passes in front of the star. Think of it as a very par away eclipse. This only works for very large planets. 2. Gravitational "wobble": A large planet attracts a star as much as the star attracts the planet, and they both orbit their joint center of gravity. Because the star is so much more massive than the planet, the star only wobbles very slightly, but over long periods it is possible to notice the differences.
The way stellar magnitude works, a smaller number is associated with increased brightness. Since -3 < -2, a magnitude -3 star would be brighter than a magnitude -2 star. Each decrease in magnitude by 1 means in increase in brightness by a factor of about 2.5119. Equivalently, each decrease in magnitude by 5 means an increase in brightness by a factor of 100. Incidentally, the brightest star in the sky (Sirius) has an apparent magnitude of only about -1.5.
Star topology.
The most common LAN topology is that of a "star." In a star topology, each computer, or "node", is connected to a central hub. This is more reliable than a more classical "ring" topology, because a node failing will not bring down the entire network. A bus topology is arguably more reliable, but has poorer performance.
The "star" topology is the most common.
Star topology
Star topology is one of the oldest topology
Star Topology, where Hubs can act as repeaters.
bus topology.
Scalability and reliabillty of star topology makes it the best, easy to remove or add a device.
Ring Topology, Mesh Topology, Bus Topology, Star Topology
star topology,bus topology,ring topology,mesh topology etc...
There are number of LAN technologies and each technology is classified into a category according to its topology , two such topologies are star and ring topology. In star topology ,The hub accepts data from a sender and delivers it to receiver, there is no security in star topology . In Ring topology Computers are connected in a circle- the first computer is cabled with the second computer.
A star topology.A star topology.A star topology.A star topology.