An astroid is a hypocycloid with four cusps - a particular form of plane curve traced from a fixed point on a circle.
Richard Nixon
astroide
the biggest asteroid to every hit earth was the one who wiped out nearly all the dinosaurs . but scientist's say on 21st of DEC 2012 a planet half the size of the earth was going to hit and cause fire tsunamis and complete destruction we don't know but we will know one day
The recent discovery in astronomy, is that Pluto is no longer a planet. Because the mass of Pluto is far less than the mass of other planets in our solar system, they have decided to take the title "planet" away from Pluto. But because it is still much bigger than any meteor or astroide, they have decided to name it a sub-planet.
They tell us that we need to be carefull, when there is a warning about a eruption. It also tellls us about the earth in many ways, such as: There is lava under the the land layer, there are many tectonic plates, and so on. Volcanoes tell us a lot about the chemical composition of rock. They tell us what incredible force there is under the earth's crust. They can be used to indicate were the earth has been hit by large astroids in the past. The shockwave from an astroide can go through the "core" to the opposite side of the earth and there cause an eruption. Volcanoes tell us more about the past than our future.
Volcanoes change the earth's surface by creating new land, destroying old vegetation, and some other dangerous stuff. Although volcanoes also create new landforms such as geysers and hot springs which are rarely dangerous. When a volcano explodes, it gives off volcanic ash which has lots of nutrients to grow plants as well.
Galileo Galilei is credited with helping to solidify the scientific method through his systematic approach to observation, experimentation, and the use of mathematical analysis in his studies. He also improved the telescope, making significant advancements in its design and use for astronomical observations and discoveries.