Composition. The Universe is composed almost completely of dark energy, dark matter, and ordinary matter. Other contents are electromagnetic radiation (estimated to constitute from 0.005% to close to 0.01% of the total mass-energy of the Universe) and antimatter.Read more
We live in the Milky Way Galaxy, which is a collection of stars, gas, dust, and a supermassive black hole at it’s very center. Our Galaxy is a spiral galaxy, which are rotating structures that are flat (disk-like) like a DVD when looked upon edge-on. There is also a bulge in the middle that consists of mostly old stars. When you look at a spiral galaxy face-on, you can see beautiful spiral arms where stars are being born. Our solar system is in the Orion arm, and we are about 25,000 light years (2.5 X 10^17 miles) from the very center of the Galaxy.Read more
The very first stars likely formed when the Universe was about 100 million years old, prior to the formation of the first galaxies. … This started the cosmic chemical enrichment that led to the formation of the stars that we see in the Milky Way today, to rocky planets and eventually humans.Read more
Our Milky Way Galaxy was once thought to comprise the entire known universe. Today our universe encompasses many billions of galaxies, and its history can be recounted back to its earliest moments.
Our universe began with an explosion of space itself – the Big Bang. Starting from extremely high density and temperature, space expanded, the universe cooled, and the simplest elements formed. Gravity gradually drew matter together to form the first stars and the first galaxies. Galaxies collected into groups, clusters, and superclusters. Some stars died in supernova explosions, whose chemical remnants seeded new generations of stars and enabled the formation of rocky planets. On at least one such planet, life evolved to consciousness. And it wonders, “Where did I come from?”Read more
Star charts are super useful for finding objects in the night sky. They are an essential tool in astronomy. Also known as a planisphere, this simple tools takes just a few minutes to master, but can help facilitate a lifetime of star gazing. Clear skies!Read more
Hubble doesn’t just look at distant nebula and galaxies, but has also observed celestial bodies and events in our own solar system. So what has it seen? Images from Hubble / NASA / ESA.
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Imagine never being able to dream of landing on Mars or traveling to Saturn.
Not because it’s impossible to get there, but because they didn’t exist. Because Earth was the only planet in our solar system. What would the night sky look like? Where would Earth be located? And how would humanity evolve?
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What If is a mini-documentary web series that takes you on an epic journey through hypothetical worlds and possibilities. Join us on an imaginary adventure — grounded in scientific theory — through time, space and chance, as we ask what if some of the most fundamental aspects of our existence were different.Read more
Some maps of the solar system stop at Neptune, or perhaps Pluto. But those charts only tell part of the story! The truth is that the space beyond the major planets is a place of perfect mystery, and there are parts of it that we didn’t even know existed until recently. So, what other secrets await far from the light of the sun? In this video, Unveiled discovers what’s hiding in the Kuiper Belt…
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#Space #SolarSystem #Mystery #Amazing #KuiperBelt #InterestingRead more
In 2014, a tiny planetesimal called 2014 MU69 and nicknamed Ultima Thule was discovered. The New Horizons spacecraft explored it on January 1, 2019, in a quick flyby. In 2016, another possible new world was found “out there” beyond the orbit of Neptune, and there could be many more waiting to be discovered.Read more
In the beginning – before the 1920s, these words had no place in our scientific understanding of the universe. Astronomers believed the cosmos to be eternal and unchanging. We knew of only one galaxy and a few million visible stars, and this was the scope of our observable universe.
Then astronomer Edwin Hubble observed, courtesy of redshift, distant galaxies speeding away from each other and formulated Hubble’s Law to explain the universe’s uniform expansion. Redshift just refers to a distant celestial body’s shift toward longer, or redder, wavelengths, compliments of the Doppler effect.Read more