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In astronomy, luminosity is the total amount of energy emitted by a star, galaxy, or other astronomical object per unit time.[1] It is related to the brightness, which is the luminosity of an object in a given spectral region.[1]

Hertzsprung-Russel StarData - Rigel - Wikipedia, the free encyclopedia

How to Tell Star Types Apart (Infographic) -- Stars come in different types, and most stars will change types throughout their lifetimes. Stars are often organized using what's known as the Hertzsprung-Russell (H-R) diagram.

How to Tell Star Types Apart (Infographic) by Karl Tate, Infographics Artist : Astronomers group stars into classes according to spectral color and brightness.

This timelapse of a similar exploding star in 2012 shows how quickly the new supernova will brighten. | A Star Just Exploded In A Nearby Galaxy

This timelapse of a similar exploding star in 2012 shows how quickly the new supernova will brighten.

Another pinner said: This timelapse of a similar exploding star in 2012 shows how quickly the new supernova will brighten.

dogon tribe africa star sirius | Sirius B is an incredibly dim star from to Sirius, the Dog Star, the ...

The Genesis of African Science and Technology: The Stars of the Deepest Origins-The Dogon's Planetary Cosmologic Knowhow

Sirius B is an incredibly dim star from to Sirius, the Dog Star, the brightest star in the night sky sky. Sirius is prominent in the night sky in Winter and Spring, and you can easily spot the brilliant star looking East and south of Orion the Hunter

How Far Away Are Our Nearest Stars?  Graphic created by Space.com showing that the closest stars and their accompanying solar systems

The nearest stars, their distances in light-years, spectral types and known planets. Only 9 of the stars within 15 light years can be seen with the unaided eye from Earth.

A user's guide to solar flares... X-class flares top the scale with the most energy and potential to disrupt communications on Earth.

sun flare - X-class flares top the scale with the most energy and potential to disrupt communications on Earth.

Scientists puzzled for decades as to why their equations did not explain the observed universe and why the infinitesimally small scale did not match the astronomically large universe ? Then then factored in Dark matter and it's polar opposite Dark energy and then computer simulations make sense BUT it's all theory, since Dark material cannot be observed but its effect on visible celestial bodies confirm their existence through billions of pieces of data extrapolated by astronomers number…

Dark Energy Dark Matter The two largest pieces of the Universe that we know the least about, yet nothing less than the ultimate fate of the Universe will be determined by them. (Illustration: NASA/CXC/M.Weiss) The Universe in a Jelly Bean Jar

Neutron stars are the densest and smallest stars known to exist in the universe; with a radius of only about 12–13 km (7 mi), they can have a mass of about twice that of the Sun.

Neutron stars are the densest and smallest stars known to exist in the universe; with a radius of only about km mi), they can have a mass of about twice that of the Sun.

Brown dwarfs are not quite massive enough to ignite nuclear fusion, yet larger than known planets. <a href="http://www.space.com/24467-brown-dwarfs-failed-stars-explained-infographic.html">See how brown dwarfs work in this SPACE.com infographic</a>.

BROWN DWARF OBJECTS >>>> Brown dwarfs are not quite massive enough to ignite nuclear fusion, yet larger than known planets.

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