Cosma Home > Communication > Knowledge > Realm > Physical > Universe > Solar System > Sun
Spotlight
Note: These are 360° Videos — press and hold to explore them!
Parker Solar Probe Mission (NASA Goddard)
Related
Pages
Physical Realm
Universe Astronomical Instrument
Galaxy Milky Way, Andromeda
Planetary System Star, Brown Dwarf, Planet, Moon
Solar System Sun
Terrestrial Planet Mercury, Venus, Earth (Moon), Mars
Asteroid Belt Ceres, Vesta
Jovian Planet Jupiter, Saturn, Uranus, Neptune
Trans-Neptunian Object
Kuiper Belt Pluto, Haumea, Makemake
Scattered Disc Eris, Sedna, Planet X
Oort Cloud Etc. Scholz’s Star
Small Body Comet, Centaur, Asteroid
Posts
- Touch the Sun (12/6/2019) - Remember how Icarus wanted to touch the Sun, but met his demise instead? Well, scientists at NASA wanted to touch the Sun too, but unlike Icarus, they succeeded! Better yet, they are beginning to share what they learned by doing it! Before we get into all of that, let’s go back and start at the … Continue reading Touch the Sun
- Get Lost in Space! (9/14/2018) - Way back in August, in anticipation of the start of a new school year, I set out to update the pages on this site related to space. Those pages tend to be popular among the teachers and students who use Cosma, and I happen to enjoy updating them, too. It sounded like a short, fun … Continue reading Get Lost in Space!
- Space Art & Junk (1/30/2018) - In certain circles it is not uncommon to trip across the debate “Is graffiti art?” You can also find scads about it online if you are so inclined (Google). However, the debate doesn’t come up all that often in the context of conversations about satellites or space… until now. Earlier this month a company named … Continue reading Space Art & Junk
- Umbraphiles (8/20/2017) - umbraphile : One who loves eclipses, often travelling to see them. — Wiktionary Yes, this is that obligatory post about “The Solar Eclipse” (NASA, Wikipedia). Of course, there had to be one — eclipses really are just too cool to ignore. You’ve already been bombarded with explanations of the science and history of eclipses, but … Continue reading Umbraphiles
- Auroras (7/17/2017) - There was a lot of talk about the potential of seeing Aurora Borealis (a.k.a. the Northern Lights) much further south than usual on Sunday night, but sadly, that didn’t pan out as predicted. The Northern Lights were a letdown in New England (Dialynn Dwyer, Boston.com) For anyone who is bummed about not seeing them, has … Continue reading Auroras
Resources
These are organized by a classification scheme developed exclusively for Cosma. More…
General
Portal
Our Sun & Solar System Internet Resources (Library of Congress)
Living With a Star Program (NASA)
Solar System Exploration, The Sun, Our Star (NASA.Gov)
Sun Portal (Wikipedia)
Dictionary
Sun : (1) the luminous celestial body around which the earth and other planets revolve, from which they receive heat and light, which is composed mainly of hydrogen and helium, and which has a mean distance from earth of about 93,000,000 miles (150,000,000 kilometers), a linear diameter of 864,000 miles (1,390,000 kilometers), and a mass 332,000 times greater than earth (2) a celestial body like the Sun — Webster
OneLook, Free Dictionary, Wiktionary, Urban Dictionary
Thesaurus
Roget’s II (Thesaurus.com), Merriam-Webster Thesaurus, Visuwords
Encyclopedia
The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma, with internal convective motion that generates a magnetic field via a dynamo process. It is by far the most important source of energy for life on Earth. Its diameter is about 109 times that of Earth, and its mass is about 330,000 times that of Earth, accounting for about 99.86% of the total mass of the Solar System. About three quarters of the Sun’s mass consists of hydrogen (~73%); the rest is mostly helium (~25%), with much smaller quantities of heavier elements, including oxygen, carbon, neon, and iron.
The Sun is a G-type main-sequence star (G2V) based on its spectral class. As such, it is informally referred to as a yellow dwarf. It formed approximately 4.6 billion years ago from the gravitational collapse of matter within a region of a large molecular cloud. Most of this matter gathered in the center, whereas the rest flattened into an orbiting disk that became the Solar System. The central mass became so hot and dense that it eventually initiated nuclear fusion in its core. It is thought that almost all stars form by this process.
The Sun is roughly middle-aged; it has not changed dramatically for more than four billion years, and will remain fairly stable for more than another five billion years. After hydrogen fusion in its core has diminished to the point at which it is no longer in hydrostatic equilibrium, the core of the Sun will experience a marked increase in density and temperature while its outer layers expand to eventually become a red giant. It is calculated that the Sun will become sufficiently large to engulf the current orbits of Mercury and Venus, and render Earth uninhabitable. — Wikipedia
Introduction
Search
Science
Heliophysics means “physics of the Sun” (the prefix “helio”, from Attic Greek hḗlios, means Sun), and appears to have been used only in that sense until quite recently. In the early times, heliophysics was concerned principally with the superficial layers of the star, and was synonymous with what is now more commonly called “solar physics”. Usage was extended explicitly in 1981 to its literal meaning, denoting the physics of the entire Sun: from center to corona, and has been used in that sense since. — Wikipedia
Note: This is a 360° Video — press and hold to explore it!
NASA Heliophysics (NASA)
Science of Heliophysics (HELIO Heliophysics Integrated Observatory)
Solar Physics (Marshall Space Flight Center)
Solar Physics Glossary (NASA)
Space Weather Prediction Center (NOAA.gov)
Space Weather.com
Space Weather (Wolfram Alpha)
Solar Storms (Wikipedia)
Future
What will happen when our sun dies? (University of Manchester, Phys.org)
The sun will become a planetary nebula after it dies, astronomers predict (Brooks Hays, UPI)
Preservation
History
Giovanni Cassini Biography (Space.com)
Giovanni Domenico Cassini (Wikipedia)
Sunspots – The Exploratorium’s Guide to Sunspots
Voyages to the Sun (Steven J. Dick, NASA’s Chief Historian)
Missions to Study the Sun (Planetary Society)
Quotation
Library
WorldCat, Library of Congress, UPenn Online Books, Open Library
Participation
Education
Crash Course Kids Space Science: The Sun and Its Influence on Earth (YouTube Channel)
Why does the sun burn us? (Space Place, NASA)
The Sun (Ask an Astronomer, Cornell University)
Sun (Cosmos4Kids)
Course
Crash Course Astronomy (YouTube)
OER Commons: Open Educational Resources
Community
News
Space Weather Live, News about the Sun (NASA), Science Daily, NPR Archives
Book
Government
Space Weather Prediction Center (NOAA)
Document
Expression
Fun
Arts
The top 10 suns in art (The Guardian)
Poem
OEDILF: The Omnificent English Dictionary In Limerick Form
Music
More…
Sun News -- ScienceDaily News about the Sun. Science articles on Sunspots and the Sun's Corona; evidence the Sun has a companion star; images from the far side of the Sun and more.
- Highest-resolution measurements of asteroid...on August 5, 2021 at 10:07 pm
A close examination of the millimeter-wavelength emissions from the asteroid Psyche, which NASA intends to visit in 2026, has produced the first temperature map of the object, providing new insight into its surface properties. The findings are a step toward resolving the mystery of the origin of this unusual object, which has been thought by some to be a chunk of the core of an ill-fated protoplanet.
- Lunar samples solve mystery of the moon's...on August 5, 2021 at 6:11 pm
Tests of glass samples gathered on Apollo missions show magnetization may result from impacts of objects like meteors, not as a result of magnetization from the presence of a magnetic shield.
- NASA's TESS tunes into an all-sky 'symphony' of...on August 5, 2021 at 6:11 pm
Using observations from NASA's Transiting Exoplanet Survey Satellite (TESS), astronomers have identified an unprecedented collection of pulsating red giant stars all across the sky. These stars, whose rhythms arise from internal sound waves, provide the opening chords of a symphonic exploration of our galactic neighborhood.
- Solving solar puzzle could help save Earth from...on August 5, 2021 at 3:55 pm
Understanding the Sun's magnetic dynamo could help predict solar weather, such as potentially dangerous geothermal storms, solar flares and sunspots. Mathematicians have proposed a new model of the Sun that matches observed data.
- Nearby star resembles ours in its youthon August 4, 2021 at 4:30 pm
New research provides a closer look at a nearby star thought to resemble our young Sun. The work allows scientists to better understand what our Sun may have been like when it was young, and how it may have shaped the atmosphere of our planet and the development of life on Earth.
Solar Flare News -- ScienceDaily Latest research news on solar flares, the solar cycle, geomagnetic storms and more.
- Solving solar puzzle could help save Earth from...on August 5, 2021 at 3:55 pm
Understanding the Sun's magnetic dynamo could help predict solar weather, such as potentially dangerous geothermal storms, solar flares and sunspots. Mathematicians have proposed a new model of the Sun that matches observed data.
- Nearby star resembles ours in its youthon August 4, 2021 at 4:30 pm
New research provides a closer look at a nearby star thought to resemble our young Sun. The work allows scientists to better understand what our Sun may have been like when it was young, and how it may have shaped the atmosphere of our planet and the development of life on Earth.
- Magnetic fields implicated in the mysterious...on July 28, 2021 at 2:57 pm
Middle-aged stars can experience their own kind of midlife crisis, experiencing dramatic breaks in their activity and rotation rates at about the same age as our Sun, according to new research. The study provides a new theoretical underpinning for the unexplained breakdown of established techniques for measuring ages of stars past their middle age, and the transition of solar-like stars to a magnetically inactive future.
- Unravelling the knotty problem of the Sun's...on July 22, 2021 at 8:30 pm
A new approach to analysing the development of magnetic tangles on the Sun has led to a breakthrough in a longstanding debate about how solar energy is injected into the solar atmosphere before being released into space, causing space weather events. The first direct evidence that field lines become knotted before they emerge at the visible surface of the Sun has implications for our ability to predict the behavior of active regions and the nature of the solar interior.
- Planetary shields will buckle under stellar winds...on July 22, 2021 at 4:12 pm
Any life identified on planets orbiting white dwarf stars almost certainly evolved after the star's death, says a new study that reveals the consequences of the intense and furious stellar winds that will batter a planet as its star is dying.