• Why do some planets have an atmosphere while others …
  • Planet - Wikipedia
  • The Nine Planets Glossary

•Exosphere: The exosphere is the outermost layer of the Earth's atmosphere.

Planets - Zoom Astronomy - Enchanted Learning

All about the planets in our Solar System

 •Troposphere: The troposphere is the lowest region in the Earth's (or any planet's) atmosphere.

The Earth's atmosphere was formed by planetary degassing, a process in which gases like carbon dioxide, water vapor, sulphur dioxide and nitrogen were released from the interior of the Earth from volcanoes and other processes.

Earth's Atmosphere - Zoom Astronomy - Enchanted Learning

It can observe large exoplanets and detect starlight filtered through their atmosphere.
Jupiter, Saturn, Uranus and Neptune collectively make up the group known as the jovian planets. The general structures of the jovian planets are opposite those of the terrestrial planets. Rather than having thin atmospheres around relatively large rocky bodies, the jovian planets have relatively small, dense cores surrounded by massive layers of gas. Made almost entirely of hydrogen and helium, these planets do not have solid surfaces.


The Nine Planets Astronomy for Kids

The Earth's atmosphere is a thin layer of gases that surrounds the Earth
Bellerophon's Fall, known simply as "The Fall" by its inhabitants, is a that is located in the Badab Sector of the . Bellerophon's Fall was formerly an industrial processing world and a sub-colony of the of in the same star system. An uprising of Imperial helots in the middle centuries of the 41st Millennium released toxic industrial waste into the planet's atmosphere, killing off much of the population and transforming this once humming hive of manufactorums into a dead world picked over by scavengers and the descendants of the former slaves, many of them . Bellerophon's Fall became the site for a major battle of the in 906.M41 between the Secessionist and the Loyalist .

A detailed discussion of the ways in which atmospheric effects determine planetary temperatures
Sarum was an Imperial world that was home to an isolated station. It was located in the Golgotha Sector of the perilously close to the permanent known as the . Sarum was a barren planet that lacked an atmosphere but was still home to extensive manufacturing facilities controlled by the Mechanicum. During the , the world was settled by the Mechanicum and transformed into an outpost of the Priesthood of Mars, but the station's soon found themselves isolated and embattled by the inhabitants of the Maelstrom. On its own against raiders, , and and without aid from , the Tech-priests of Sarum became isolationists and founded a deviant cult of the under the leadership of the Magos Redjak. Redjak solidified his so-called Crimson Priesthood's power over Sarum and used the technological prowess of the Mechanicum that he commanded to gain political control over much of the Golgothan Sector by the end of the 30th Millennium. However, when Sarum faced a massive invasion by the Abhuman Brotherhood of Ruin and their allies, the Tech-priests of that world pleaded for aid from the 's and finally received it in the form of the 13th Expeditionary Fleet of the , led personally by the . In the ensuing Imperial campaign that became known as the Golgothan Slaughter, the Brotherhood of Ruin and its Ork mercenaries were annihilated by the World Eaters. However, Angron next turned his wrath on the Crimson Priests of Sarum, scouring the planet and claiming it as his forward operating base for the next eleven years in a campaign against the Crimson Priests' remaining empire in the sector.

Welcome to The Nine Planets - For Kids

This airless, barren planet was home to a small community of hermits who for millennia had lived out a simple life of contemplation and study in a reclusium. This was shattered when the Sorcerer Mordant Hex attacked and vented some of the beguiled and strangely calm hermits into the airless atmosphere. The Thousand Sons then penetrated deep into the mountain fortress with little resistance on a hunt for something. The planet had held a deep secret, a long forgotten webway portal which Ahriman then used to gain entrance to the webway in Abaddon’s 13th Black Crusade. After the Campaign ended, Ahriman was ejected from the Webway and the webway gate permanently sealed.

Exciting children's astronomy web site

Drenthal is an that is the fifth planet of the in the . A seemingly endless ocean covers Drenthal, dotted by island archipelagos and vast floating habitations. It is home to a number of large training academies. Due to its stable atmospherics, Drenthal has long been used as a training center by the Aeronautica Imperialis. Oceans cover almost ninety-five per cent of the planet's surface, so the flight academies of the Imperial Navy are contained upon colossal carriers, each as large as a small city and covered with landing strips, hangars and barracks. The rest of the world's population exists upon floating metropolises known as seasteads, or else make their home upon scattered archipelagos of bleached shard-coral. The world came under sustained attack by the in service to during the of the early 42nd Millennium, and the servants of the Plague God proved successful in claiming the planet. The oceans have turned blood-red as butchered corpses bob and float upon the surging tide and -forged whirl and screech in the skies overhead.

Atmospheric Effects on Planetary Surface Temperatures

Ohmsworld is a controlled by the and located in the of the . It is currently a front line in the conflict consuming the . A dense and toxic atmosphere makes Ohmsworld inimical to human life. None visit the world or choose to live within its countless small hive spires because of the hideous environment and the dramatic weather. Instead, most residents are the descendants of human colonists who were compelled to live upon the planet due to its unusual mineral assets. This is because the atmospheric contaminants make Ohmsworld a valuable holding. Through careful atmosphere filtration, the inhabitants can obtain several chemicals and compounds key in the creation of .