The Moon is inside Earth's atmosphere, European researchers say
Scientists examined data from 20 years ago to reach a startling new conclusion.
- Observations made by the SOHO spacecraft over 20 years ago lead to a new discovery.
- The Earth has a hydrogen envelope as part of its outer atmosphere called the geocorona.
- The geocorona stretches well past the Moon, reveals a study.
We are more linked to the Moon than we've realized. It turns out that the outer part of the Earth's atmosphere stretches considerably past the lunar orbit. In fact, it goes as far as twice the distance to the Moon.
This discovery is a product of observations by the Solar and Heliospheric Observatory (SOHO) — a spacecraft launched in 1995 to study the sun, operated by the European Space Agency (ESA) and NASA.
Measurements taken over 20 years ago by SOHO got a fresh look in a new study, which came to remarkable conclusions. What the data showed is that the geocorona, a hydrogen envelope which wraps around our planet, extends up to 630,000 km (391,464 miles) away from it. This distance is 50 times the Earth's diameter.
Earth's geocorona from the Moon. An ultraviolet picture taken in 1972 with camera operated by Apollo 16 astronauts on the Moon. Image source: European Space Agency
Igor Baliukin of Russia's Space Research Institute, the lead author of the study on the subject, explained that "the moon flies through Earth's atmosphere."
The geocorona appears where the planet's atmosphere comes into contact with outer space. It's essentially a cloud of hydrogen atoms. Between 1996 and 1998, SWAN, an instrument aboard the SOHO spacecraft, was able to use its sensors to follow hydrogen signatures, thus pinpointing the edges of the geocorona
"Data archived many years ago can often be exploited for new science," said Bernhard Fleck, a European Space Agency SOHO project scientist. "This discovery highlights the value of data collected over 20 years ago and the exceptional performance of SOHO."
The extent of Earth's geocorona. Image source: ESA
Besides being transformative in understanding our own atmosphere, the discovery may be helpful in searching for planets with water beyond our solar system. Detecting the presence of hydrogen in their outer atmospheres can mean the presence of water vapor near the surface.
Check out more SOHO accomplishments over 20 years in space:
- Here's what real science says about the role of CO2 as Earth's ... ›
- Outer space - Wikipedia ›
- Earth's Atmosphere Extends Far Beyond the Moon, Scientists Discover ›
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Great ideas in philosophy often come in dense packages. Then there is where the work of Marcus Aurelius.
- Meditations is a collection of the philosophical ideas of the Roman Emperor Marcus Aurelius.
- Written as a series of notes to himself, the book is much more readable than the dry philosophy most people are used to.
- The advice he gave to himself 2,000 years ago is increasingly applicable in our hectic, stressed-out lives.
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- Many of the things that we experience, are our imagination manifesting into this physical realm, avers artist Dustin Yellin.
- People need to completely rethink the way they work together, and learn from one another, that they they can build better systems. If not, things may get "really dark" soon.
- The first step to enabling cooperation is figuring out where the common ground is. Through this method, despite contrary beliefs, we may be able to find some degree of peace.
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