Can you see snow from space?
Space & NavigationSouthern Snow (Image credit: NASA Earth Observatory.) The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite caught this unusual view of snow across the southern United States on Jan. Is there a planet with snow? Due to the planet’s extreme surface temperatures, this rain would evaporate before landing. Yet even more bizarrely, there is
What kind of mirror is used in vehicles?
Space & NavigationConvex mirrorConvex mirror: different uses One of the most common uses for the convex mirror is the passenger-side mirror on your car. These convex mirrors are used for cars because they give an upright image and provide a wider field of view as they are curved outwards. What type of mirror is used in vehicles?
Why is the circumference of 2 Pi r?
Space & NavigationIt sounds like you are aware of this, but just to clarify: the formulae 2πr and πd for the circumference of the circle are equivalent because the diameter is twice the radius. The former statement is often more useful simply because the radius of a circle is a property that we often refer to. Why
What is Boolean logic used for?
Space & NavigationWhat is Boolean logic? Programs use simple comparisons to help make decisions. Boolean logic is a form of algebra where all values are either True or False. These values of true and false are used to test the conditions that selection and iteration are based around. What can Boolean be used for? Boolean Operators are
Is every group of order 4 cyclic?
Space & NavigationWe will now show that any group of order 4 is either cyclic (hence isomorphic to Z/4Z) or isomorphic to the Klein-four. Is group of order 4 always cyclic? The order of an element of a group must divide the order of the group. So a group of order 4 can only have elements of
Where are most comets in our solar system located?
Space & NavigationThere are likely billions of comets orbiting our Sun in the Kuiper Belt and even more distant Oort Cloud. Where are most comets found in the solar system? The Oort Cloud It is thought that most comets originate in a vast cloud of ice and dust that surrounds the solar system. The Oort Cloud, as