Current Events

  • Irish Chronicles Document Links Between Volcanoes and Weather
    A study of over 40,000 written entries in Irish Annals and ice core measurements shows a strong corr...Read more

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    Irish Chronicles Document Links Between Volcanoes and Weather

    A study of over 40,000 written entries in Irish Annals and ice core measurements shows a strong correlation between the occurrence of volcanic eruptions and extreme cold weather in Ireland over a 1200 year period. Data analyzed in this study cover the period from 431 to 1649, during which time up to 48 volcanic eruptions are identified in Greenland ice core records through deposition of volcanic sulfate in annual layers of ice. You can find the study (open access), published on 6 June 2013 in IOP Publishing's journal Environmental Research Letters, at http://iopscience.iop.org/1748-9326/8/2/024035/article. Find out more about how volcanoes can influence climate.
  • EF-5 Tornado in El Reno, Oklahoma Widest Ever Recorded in US
    The EF-5 tornado that hit El Reno, Oklahoma on May 31st was the widest ever recorded in the US, acco...Read more

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    EF-5 Tornado in El Reno, Oklahoma Widest Ever Recorded in US

    The EF-5 tornado that hit El Reno, Oklahoma on May 31st was the widest ever recorded in the US, according to the National Weather Service in Norman Oklahoma. The tornado, which remained on the ground for 40 minutes and reached 2.6 miles across (4.2 km), took the lives of 18 people including storm chasers Tim Samaras, Paul Samaras and Carl Young. For more information on the tornado, visit http://ow.ly/i/2hfDG.
  • Atmospheric CO2 Level Tops 400 ppm
    During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm rep...Read more

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    Atmospheric CO2 Level Tops 400 ppm

    During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm repeatedly. Daily levels of CO2 can vary due to weather, and there are seasonal trends as well. The level of atmospheric greenhouse gases continues to increase, now over 120 ppm since the Industrial Revolution began. For more on the Keeling Curve, see http://keelingcurve.ucsd.edu/. Find out more about greenhouse gases and warming.

Our Solar System

Our solar system is filled with a wide assortment of celestial bodies - the Sun itself, our eight planets, dwarf planets, and asteroids - and on Earth, life itself! The inner solar system is occasionally visited by comets that loop in from the outer reaches of the solar system on highly elliptical orbits. In the outer reaches of the solar system, we find the Kuiper Belt and the Oort cloud. Still farther out, we eventually reach the limits of the heliosphere, where the outer reaches of the solar system interact with interstellar space. Solar system formation began billions of years ago, when gases and dust began to come together to form the Sun, planets, and other bodies of the solar system.

A near-Earth <a href="/our_solar_system/asteroids.html&edu=high&dev=1">asteroid</a> - named 2012 DA14 by astronomers – passed within 17,200 miles from Earth on February 15, 2013. On closest approach at about 1:25 p.m. CST on February 15, although it was within the orbit of the <a href="/earth/moons_and_rings.html&edu=high&dev=1">Moon</a> and even geosynchronous <a href="/space_missions/satellites.html&edu=high&dev=1">satellites</a>, it didn't strike Earth! Find out more from <a href="http://www.nasa.gov/mission_pages/asteroids/news/asteroid20130201315144.html">NASA</a>! Fragments of a meteorite hit Chelyabinsk, Russia on 2/15/2013 <a href="http://www.reuters.com/article/2013/02/15/us-russia-meteorite-idUSBRE91E05Z20130215">injuring over 500</a>. Learn about <a href="http://www.windows2universe.org/our_solar_system/meteors/meteors.html">meteors and meteorites</a>.<p><small><em>NASA/JPL-CalTech</em></small></p>Neptune's <a href="/neptune/lower_atmosphere.html&edu=high&dev=1">atmosphere</a> shows a striped pattern of <a href="/neptune/atmosphere/N_clouds_overview.html&edu=high&dev=1">clouds</a>. This cloud pattern is very similar to that of <a href="/jupiter/jupiter.html&edu=high&dev=1">Jupiter</a> and <a href="/saturn/saturn.html&edu=high&dev=1">Saturn</a>. Neptune even has a <a href="/neptune/atmosphere/N_clouds_GDS.html&edu=high&dev=1">Great Dark Spot</a> similar to Jupiter's <a href="/jupiter/atmosphere/J_clouds_GRS.html&edu=high&dev=1">Great Red Spot</a>. The Great Dark Spot of Neptune is thought to be a hole, similar to the hole in the <a href="/earth/Atmosphere/ozone_layer.html&edu=high&dev=1">ozone layer on Earth</a>, in the <a href="/physical_science/chemistry/methane.html&edu=high&dev=1">methane</a> cloud deck of Neptune.<p><small><em>Image courtesy of NASA</em></small></p>This dramatic view of Jupiter's <a href="/jupiter/atmosphere/J_clouds_GRS.html&edu=high&dev=1">Great Red Spot</a> and its surroundings was obtained by <a href="/space_missions/voyager.html&edu=high&dev=1">Voyager 1</a> on Feb. 25, 1979, when the spacecraft was 5.7 million miles (9.2 million kilometers) from Jupiter. Cloud details as small as 100 miles (160 kilometers) across can be seen here. The colorful, wavy cloud pattern to the left of the Red Spot is a region of extraordinarily complex end variable wave motion.<p><small><em>Image courtesy of NASA</em></small></p>Have you ever seen the <a href="/earth/Magnetosphere/aurora.html&edu=high&dev=1">Southern or Northern Lights</a>? Earth isn't the only planet that puts on these beautiful light shows, which are also called the "<a href="/earth/Magnetosphere/aurora.html&edu=high&dev=1">aurora</a>". Aurora have been seen at both <a href="/saturn/saturn_polar_regions.html&edu=high&dev=1">poles of Saturn</a>, too, as well as at the poles of <a href="/jupiter/magnetosphere/jupiter_aurora.html&edu=high&dev=1">Jupiter</a>. These "<a href="/earth/Magnetosphere/tour/tour_earth_magnetosphere_09.html&edu=high&dev=1">curtains of light</a>" sometimes rise 1,200 miles (2,000 km) above the <a href="/saturn/atmosphere/S_clouds_overview.html&edu=high&dev=1">cloud tops</a> near Saturn's poles. The <a href="/space_missions/HST.html&edu=high&dev=1">Hubble Space Telescope</a> took this picture in 2004.<p><small><em>Image courtesy of NASA, ESA, J. Clarke (Boston University), and Z. Levay (STScI)</em></small></p>This historic image is the first ever taken from a spacecraft in orbit about <a href="/mercury/mercury.html&edu=high&dev=1">Mercury</a>, the innermost planet of the solar system. Taken on 3/29/2011 by <a href="/space_missions/robotic/messenger/messenger.html&edu=high&dev=1">MESSENGER</a>, it shows numerous craters across the <a href="/mercury/Interior_Surface/Surface/surface_overview.html&edu=high&dev=1">surface</a> of the planet. Temperatures there can reach over 800°F because Mercury is so close to the Sun and rotates so slowly. MESSENGER entered orbit around Mercury earlier in March 2011.<p><small><em>NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington</em></small></p>Comets are <a href="/comets/comet_nucleus.html&edu=high&dev=1">lumps</a> of ice and dust that periodically come into the center of the solar system from its <a href="/comets/Oort_cloud.html&edu=high&dev=1">outer reaches</a>. Some comets make <a href="/comets/perihelion_pass.html&edu=high&dev=1">repeated trips</a> to the inner solar system. When comets get close enough to the Sun, heat makes them start to <a href="/comets/sublimation.html&edu=high&dev=1">evaporate</a>. Jets of gas and dust form long <a href="/comets/tail.html&edu=high&dev=1">tails</a> that we can see from Earth. This photograph shows <a href="/comets/comets_table.html&edu=high&dev=1">Comet Kohoutek</a>, which visited the inner solar system in 1973. It has an <a href="/physical_science/physics/mechanics/orbit/orbit_shape_interactive.html&edu=high&dev=1">orbit</a> of about 75,000 years!<p><small><em>Image courtesy of NASA</em></small></p>

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Explore Our Solar System

Solar System Formation

Solar system formation began billions of years ago, when gases and dust began to come together ...Read more

Sun

The Sun is the closest star to Earth and is the center of our solar system. A giant, spinning ...Read more

Planets

By the current count of astronomers, our solar system includes 8 planets and 5 dwarf planets. ...Read more

Dwarf Planets

In 2006 the International Astronomical Union (IAU) approved a new classification scheme for ...Read more

Asteroids

Asteroids are small bodies that are believed to be left over from the beginning of the solar ...Read more

Meteors, Meteoroids, and Meteorites

Meteors are streaks of light, usually lasting just a few seconds, which people occasionally ...Read more

Comets

Not long ago, many people thought that comets were a portent that something bad was about ...Read more

Poles in Space

The areas around the North and South Poles of planets, moons, and even the Sun are often interesting ...Read more

Culture, Myth, and Arts

Make important cultural connections about the Sun, planets, and the Moon. ...Read more

Solar System Discoveries

Who discovered the planets? For many of the planets in the solar system, we'll never know! ...Read more

More about Our Solar System

Historical Events

6/25 Hermann Oberth,a Romanian and German physicist, was born on this date in 1894 Details
6/28 Maria Mitchell, an American astronomer, died on this date in 1889 Details
6/29 George Hale, an American astronomer, was born on this date in 1869 Details

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Did you know?

Did you know that our Solar System has a new dwarf planet? Astronomers have officially categorized Haumea as a dwarf planet.

Did you know that our solar system now has eight planets and five dwarf planets, according to the International Astronomical Union?

 

Earth and Space Science Concept of the Day

Do you know what this word or phrase means?

Adiabatic
xAdiabatic : An adiabatic process happens without any heat transfer with the environment.

Click on the word to find out!

Research Highlights

Unprecedented Warming in East Africa's Lake Tanganyika

Lake Tanganyika, the second-oldest and second-deepest lake in the world, could be in for some rough waters. Geologists have determined that the East African rift lake has experienced unprecedented warming...Read more

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Our Glaciers: Then and Now activity kit helps you see the changes taking place in glaciers around the world. See all our activity kits and classroom activities.

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