atmosphere

Showing 11 posts tagged atmosphere

How can we know the size, composition, and atmospheric makeup of distant exoplanets? NASA explains the details in this Alien Atmospheres video. 

By observing periodic variations in the parent star’s brightness and color, astronomers can indirectly determine an exoplanet’s distance from its star, its size, and its mass. But to truly understand an exoplanet astronomers must study its atmosphere, and they do so by splitting apart the parent star’s light during a planetary transit. 

Watch more astronomy videos, including Measuring the Universe and The Hubble Ultra Deep Field.

via Boing Boing.

What did Mars look like 4 billion years ago? The team at NASA’s Conceptual Image Lab have an idea based on the existing evidence:

Billions of years ago when the Red Planet was young, it appears to have had a thick atmosphere that was warm enough to support oceans of liquid water - a critical ingredient for life. The animation shows how the surface of Mars might have appeared during this ancient clement period, beginning with a flyover of a Martian lake. The artist’s concept is based on evidence that Mars was once very different. Rapidly moving clouds suggest the passage of time, and the shift from a warm and wet to a cold and dry climate is shown as the animation progresses. The lakes dry up, while the atmosphere gradually transitions from Earthlike blue skies to the dusty pink and tan hues seen on Mars today.

The animation was released in anticipation of November 18th’s Cape Canaveral launch of MAVEN, Mars Atmosphere and Volatile Evolution mission. MAVEN will explore the planet’s lost atmosphere.

Previously: flying over a topographically accurate landscapes of Mars, and more NASA.

via PopSci.

Where might we find life in our solar system? Via skeptvScientific American Space Lab has a countdown for that: Top 5 Places to Look for Alien LifeBonus — the video comes with additional reading material:  

Is There Life on Venus?

Venus May Have Had Continents and Oceans

Was Venus Alive? ‘The Signs Are Probably There’

Tiny Saturn Moon ID’d As Good Candidate For Alien Life

Planet Profile for Titan

The Europa Report: A Report

Mars vs. Europa: Are we looking in the wrong place for alien life?

Mars Rover Finds Evidence of Ancient Habitability

Next Mars Rover Will Seek Out Signs of Past Life

Follow this up with Brian Cox's favorite wonder, Saturn’s largest moon: Titan.

From PBS’ Digital Studios, It’s Okay to Be Smart's The Auroras, Earth’s Art Show! Learn More about the invisible forcefield — a magnetic field — that protects all life on Earth from space radiation, primarily Sun’s solar winds that bombard our atmosphere constantly. 

jtotheizzoe:

All that science has a beautiful side effect: It makes the auroras! The Northern and Southern lights are the result of the solar wind and its dance with Earth’s magnetic field and polar atmosphere. It’s like our own cosmic light show!

Watch more about space weather and magnetic fields, plus dont’ miss this fabulous-looking vid about how the aurora borealis is created in our archives.