Thus, the universe has no bounds and will also expand forever, but with the rate of expansion gradually approaching zero after an infinite amount of time. This is termed a flat universe or a Euclidian universe (because the usual geometry of non-curved surfaces that we learn in high school is called Euclidian geometry).

2023年7月21日 · As seen in the graphic below, this "shape" tells us about the age of the universe. Recent determinations of the value of the Hubble Constant are resulting in an ever-narrowing range of values. An international team of scientists led by Dr. Wendy Freedman of Carnegie Observatories in Pasadena, Calif., used the Hubble Space Telescope to look at ...

It is our Sun and everything that travels around it. Our solar system is elliptical in shape. That means it is shaped like an egg. The Sun is in the center of the solar system. Our solar system is always in motion. Eight known planets and their moons, along with comets, asteroids, and other space objects orbit the Sun. The Sun is the biggest ...

Pythagoras reasoned that if the Moon was round, then the Earth must be round as well. After that, sometime between 500 B.C. and 430 B.C., a fellow called Anaxagoras determined the true cause of solar and lunar eclipses - and then the shape of the Earth's shadow on the Moon during a lunar eclipse was also used as evidence that the Earth was round.

Galaxies are labeled according to their shape. Some galaxies are called "spiral", because they look like giant pinwheels in the sky. The galaxy we live in, the Milky Way, is a spiral galaxy. Some galaxies are called "elliptical", because they look like flat balls. A galaxy may be called "irregular" if it doesn't really have a shape.

Galaxies are scattered throughout the universe and they vary greatly in size. A galaxy may be alone or it may be in a large group of galaxies called a "supercluster". Galaxies are classified by scientists according to their shape and appearance. An irregular galaxy has an undefined shape and is full of young stars, dust, and gas.

Other scientists believe that dark matter may be composed of strange particles which were created in the very early universe. Such particles may include axions, weakly interacting massive particles (called WIMPs), or neutrinos. Understanding dark matter is important to understanding the size, shape and future of the universe.

I was going to answer a question about the shape of the universe this month, but it will have to wait. Instead, I'd like to write about the StarDog character found throughout this site. He was based on my best friend, Oppy. You could find Oppy's picture whenever you selected the link to my name on the bottom of each page.

Inflation solves many problems with the simple, original Big Bang. It explains why the universe is so big and so smooth, why at least four different forces act in it today, and where the large amounts of matter that make up the universe came from. Steady State. The idea that the universe had a specific beginning did not appeal to all scientists.

Olympus Mons is called a shield volcano because of its shape. The volcano is very tall, but it has a very gentle slope. Olympus Mons is over twenty times wider than it is high. It is the same kind of volcano as the active volcanoes currently making the Hawaiian Islands.