Universe


What makes up the universe September 3

Until roughly 1985, astronomers believed that the universe was composed of ordinary matter, such as protons, neutrons and electrons. However, when astronomers made accurate measurements of cosmic microwave background fluctuations and measured the mot

Does the universe end September 3

The Observable Universe is a sphere with the Earth in its center. It has a radius of 13.7 billion light years, which is the age of the universe. Things beyond this sphere are invisible because the Universe is expanding faster than the light can reach

How many atoms are in the universe September 3

The observable universe is estimated to traverse approximately 93 billion light years. Scientists estimate that between 300 and 500 billion galaxies exist within the known universe, or, more precisely, as far as the most distant objects are able to b

What is the Friedmann universe theory September 3

General relativity suggests that space is not solid. It can bend into many different shapes and is, in fact, not expanding. It is the space between points in the universe that is expanding. The distances between these points become greater over time.

Is there sound in space September 3

True sound waves are only able to spread through a medium that puts molecules in contact, or near contact, with each other. As the wave of sound passes, the affected molecules press against nearby, unaffected molecules. The result is a moving wave of

How many modern constellations are there September 3

How many modern constellations are there
The modern constellations include: Antlia, the pump; Apus, the bird of paradise; Camelopardalis, the giraffe; Canes Venatici, the hunting dogs; Carina, the keel; Columba, the dove; Coma Bern ...

What are some facts about the Aurora Borealis September 3

What are some facts about the Aurora Borealis
Aurora Borealis affects radio and satellite communications. The name Aurora comes from the Roman goddess of dawn. Borealis comes from the Greek word Boreas, which means North wind. Borealis ...

Why did people once believe that Earth was the center of the Universe September 3

Why did people once believe that Earth was the center of the Universe
In the early 1500s, Nicolaus Copernicus published the first major theoretical work that challenged the notion of an Earth-centered universe. Copernicus theorized a sun-centered universe, or ...

What is the temperature of a black hole September 3

What is the temperature of a black hole
Even though the temperature within a black hole itself is extraordinarily cold, it can be surrounded by extremely hot materials. A black hole pulls gas and other materials into its gravity w ...

How many solar systems are there July 28

How many solar systems are there
Credit:Science Photo Library - MARK GARLICK.Brand X PicturesGetty ImagesA galaxy is made up of billions of stars, some of which have their own solar systems. Considering that the billions of ...

What is gravitational attraction July 28

Gravitational attraction also governs the movement of celestial bodies. Gravity keeps the planets in orbit around the sun and the moon around the Earth. This force gives rise to the tides when the moon's gravity pulls on the Earth. The escape speed o

How far does space go July 28

As of 2014, the universe is 13.8 billion years old, Space reports. Given the speed of light, this places the farthest objects that can be seen from Earth as those that sit on that boundary. The universe is expanding, so objects at the extreme range o

What does NASA say about galactic alignment July 28

What does NASA say about galactic alignment
Credit:Baris SimsekE+Getty ImagesScientists believe there is a super massive black hole at the center of the Milky Way that is approximately 4 million times more massive than the sun. The ce ...

What is Kepler's Universe Theory July 28

Kepler based his theories on the ideas of Copernicus, who had previously proposed that the sun, rather than the Earth, was the center of the solar system. Working from this perspective, Kepler began to carefully observe the motion of the planets, par

What is Ptolemy's universe theory July 28

Ancient Greek astronomers believed that planets followed perfect circular patterns. Astronomers observed patterns of celestial movement, such as the moon rising an hour later each day and the sun's change in path across the sky. The Ptolemaic system

Are there other universes out there July 28

In the standard model, the universe rapidly expanded following the Big Bang in a process known as inflation, which scientists have been able to find evidence of by studying what's known as cosmic microwave background. As the universe is still expandi

How did the universe begin July 28

At the time of the Big Bang, the universe and all of its matter was concentrated in a single point. As the Big Bang started, this matter was heated to very high temperatures and expanded rapidly. Several scientific observations have convinced astrono
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