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천문우주지식정보 (kasi.re.kr)

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01 태양계를 이루는 행성(1)

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01 태양계를 이루는 행성(1)

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태양계를 이루는 행성들을 관찰해봅시다.

https://solarsystem.nasa.gov/solar-system/our-solar-system/overview/

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Overview Since 1998, NASA's Solar System Exploration hub has served as a real-time, living encyclopedia of the scientific exploration of our solar system. We provide reliable, accurate, up-to-date information about the planets, moons, asteroids, comets, and everything else in our solar system and the spacecraft that explore them.

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https://nssdc.gsfc.nasa.gov/planetary/factsheet/

Planetary Fact Sheet - Ratio to Earth (nasa.gov)

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* - See the Fact Sheet Notes.

Planetary Fact Sheet in U.S. Units

Planetary Fact Sheet - Values compared to Earth

Index of Planetary Fact Sheets - More detailed fact sheets for each planet

Notes on the Fact Sheets - Explanations of the values and headings in the fact sheet

Schoolyard Solar System - Demonstration scale model of the solar system for the classroom

Author/Curator:
Dr. David R. Williams,dave.williams@nasa.gov
NSSDCA, Mail Code 690.1
NASA Goddard Space Flight Center
Greenbelt, MD 20771
+1-301-286-1258

NASA Official: Dr. David R. Williams, david.r.williams@nasa.gov
Last Updated: 21 October 2019, DRW

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See the Fact Sheet Notes. Planetary Fact Sheet in U.S. Units Planetary Fact Sheet - Values compared to Earth Index of Planetary Fact Sheets - More detailed fact sheets for each planet Notes on the Fact Sheets - Explanations of the values and headings in the fact sheet Schoolyard Solar System - Demonstration scale model of the solar system for the classroom Author/Curator: Dr. David R.

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태양의 특징을 함께 살펴봅시다.

https://earthobservatory.nasa.gov/images/37575/sunspots-at-solar-maximum-and-minimum

https://youtu.be/nNng0KrNUuI

https://solarsystem.nasa.gov/solar-system/sun/in-depth/

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Our Sun is a 4.5 billion-year-old yellow dwarf star - a hot glowing ball of hydrogen and helium - at the center of our solar system. It's about 93 million miles (150 million kilometers) from Earth and it's our solar system's only star. Without the Sun's energy, life as we know it could not exist on our home planet.

10 things

The part of the Sun we see from Earth - the part we call the surface - is the photosphere. The Sun doesn't actually have a solid surface because it's a ball of plasma.

The Sun would have been surrounded by a disk of gas and dust early in its history when the solar system was first forming 4.6 billion years ago. Some of that dust is still around today, in several dust rings that circle the Sun. They trace the orbits of planets, whose gravity tugs dust into place around the Sun.

As a star, the Sun doesn't have any moons, but the planets and their moons orbit the Sun.

Once material leaves the corona at supersonic speeds, it becomes the solar wind, which forms a huge magnetic "bubble" around the Sun, called the heliosphere. The heliosphere extends beyond the orbit of the planets in our solar system. Thus, Earth exists inside the Sun's atmosphere. Outside the heliosphere is interstellar space.

In one of the Sun's biggest mysteries, the corona is much hotter than the layers immediately below it. (Imagine walking away from a bonfire only to get warmer.) The source of coronal heating is a major unsolved puzzle in the study of the Sun.

Solar activity can release huge amounts of energy and particles, some of which impact us here on Earth. Much like weather on Earth, conditions in space - known as space weather - are always changing with the Sun's activity. "Space weather" can interfere with satellites, GPS, and radio communications. It also can cripple power grids, and corrode pipelines that carry oil and gas.

Another solar flare on March 13, 1989, caused geomagnetic storms that disrupted electric power transmission from the Hydro Québec generating station in Canada, plunging 6 million people into darkness for 9 hours. The 1989 flare also caused power surges that melted power transformers in New Jersey.

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From our vantage point on Earth, the Sun may appear like an unchanging source of light and heat in the sky. But the Sun is a dynamic star, constantly changing and sending energy out into space. The science of studying the Sun and its influence throughout the solar system is called heliophysics.

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Sunspots | Center for Science Education (ucar.edu)
Homepage | NOAA / NWS Space Weather Prediction Center

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Sunspots are dark, planet-sized regions that appear on the surface of the Sun. They are caused by twisting, chaotic magnetic fields from within the Sun's convective zone. These powerful magnetic disturbances produce active regions on the Sun, which can often create solar flares and coronal mass ejections (CMEs). Because sunspots are associated with increased solar activity, space weather forecasters track these features to help predict solar storms that can impact Earth.

Why Are Sunspots Dark?

Sunspots appear dark because they are cooler than their surroundings. Large sunspots are thousands of degrees cooler than the areas that surround them (about 4,200 °C for a sunspot compared to 6,000 °C for the photosphere surrounding it). Sunspots are only dark in contrast to the bright face of the Sun. If you could cut an average sunspot out of the Sun and place it elsewhere in the night sky, it would be about as bright as the full Moon. Sunspots have a lighter, outer section called the penumbra and a darker, central region named the umbra.

Sunspots and the Solar Cycle

Sunspots can last for weeks or even years before dissipating. The number of sunspots varies over a multi-year cycle. Historical records going back to the 1700s reveal that this sunspot cycle is roughly eleven years long - though sometimes it is longer or shorter.

The Sun is typically very active when sunspot counts are high. A peak in the sunspot count is referred to as a time of solar maximum, whereas a period when few or no sunspots appear is called a solar minimum.

The 11-year sunspot cycle is actually half of a longer, 22-year cycle of solar activity During this period, sunspot counts reach maximum and minimum twice.

How Do Sunspots Impact Earth?

Sunspots can cause geomagnetic storms in Earth's magnetosphere. During a solar maximum, when sunspot numbers are at their peak, the Sun emits more radiation than usual. Plasma emitted from the Sun shoots millions of electrons and protons toward Earth. These charged solar particles can enter the atmosphere and create beautiful auroras, but they can also disrupt infrastructure, such as satellites, navigation, communications, and the electric power grid. The Space Weather Prediction Center monitors solar activity, such as sunspots and solar flares, so we can prepare for potential disruptions.

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Sunspots are dark, planet-sized regions that appear on the surface of the Sun. They are caused by twisting, chaotic magnetic fields from within the Sun's convective zone. These powerful magnetic disturbances produce active regions on the Sun, which can often create solar flares and coronal mass ejections (CMEs).

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우주전파센터
ㄴhttps://spaceweather.rra.go.kr/main.do

우주환경연구센터
ㄴ http://kswrc.kasi.re.kr/ko/main

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예) 1 모둠 탐구활동

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예) 1 모둠 탐구활동