Pasadena, CA – Cloudy days are rare in the thin, dry atmosphere of Mars. Clouds are typically found at the planet’s equator in the coldest time of year, when Mars is the farthest from the Sun in its oval-shaped orbit. But one full Martian year ago – two Earth years – scientists noticed clouds forming over NASA’s Curiosity rover earlier than expected.
This year, they were ready to start documenting these “early” clouds from the moment they first appeared in late January.
NASA’s Jet Propulsion Laboratory
Pasadena, CA – Even after decades of observations and a visit by NASA’s Voyager 2 spacecraft, Uranus held on to one critical secret — the composition of its clouds. Now, one of the key components of the planet’s clouds has finally been verified.
A global research team that includes Glenn Orton of NASA’s Jet Propulsion Laboratory in Pasadena, California, has spectroscopically dissected the infrared light from Uranus captured by the 26.25-foot (8-meter) Gemini North telescope on Hawaii’s Mauna Kea. They found hydrogen sulfide, the odiferous gas that most people avoid, in Uranus’ cloud tops. The long-sought evidence was published in the April 23rd issue of the journal Nature Astronomy.
Written by Carol Rasmussen
Washington, D.C. – A new NASA study shows that updrafts are more important than previously understood in determining what makes clouds produce drizzle instead of full-sized raindrops, overturning a common assumption.
The study offers a pathway for improving accuracy in weather and climate models’ treatments of rainfall — recognized as one of the greater challenges in improving short term weather forecasts and long-term climate projections.
The research by scientists at NASA’s Jet Propulsion Laboratory in Pasadena, California; UCLA; and the University of Tokyo found that low-lying clouds over the ocean produce more drizzle droplets than the same type of cloud over land. The results are published online in the Quarterly Journal of the Royal Meteorological Society.
Written by Carol Rasmussen
Washington, D.C. – A new analysis of 15 years of NASA satellite cloud measurements finds that clouds worldwide show no definitive trend during this period toward decreasing or increasing in height. The new study updates an earlier analysis of the first 10 years of the same data that suggested cloud heights might be getting lower.
Clouds are both Earth’s cooling sunshade and its insulating blanket. Currently their cooling effect prevails globally. But as Earth warms, the characteristics of clouds over different global regions — their thickness, brightness and height — are expected to change in ways that scientists don’t fully understand.
NASA’s Aeronomy of Ice in the Mesosphere (AIM) Spacecraft sees Noctilucent Cloud Season begin over Antarctica
Written by Lina Tran
Greenbelt, MD – Data from NASA’s Aeronomy of Ice in the Mesosphere, or AIM, spacecraft shows the sky over Antarctica is glowing electric blue due to the start of noctilucent, or night-shining, cloud season in the Southern Hemisphere – and an early one at that.
Noctilucent clouds are Earth’s highest clouds, sandwiched between Earth and space 50 miles above the ground in a layer of the atmosphere called the mesosphere.
Written by Ellen Gray
Clouds are among the most important mediators of heat reaching Earth’s surface. Where clouds are absent, darker surfaces like the ocean or vegetated land absorb heat, but where clouds occur their white tops reflect incoming sunlight away, which can cause a cooling effect on Earth’s surface.
NASA’s Cassini Mission data reveals Jupiter’s Red Spot probably created by Chemical reaction to Sunlight
Written by Preston Dyches
Pasadena, CA – The ruddy color of Jupiter’s Great Red Spot is likely a product of simple chemicals being broken apart by sunlight in the planet’s upper atmosphere, according to a new analysis of data from NASA’s Cassini mission. The results contradict the other leading theory for the origin of the spot’s striking color — that the reddish chemicals come from beneath Jupiter’s clouds.
The results are being presented this week by Kevin Baines, a Cassini team scientist based at NASA’s Jet Propulsion Laboratory, Pasadena, California, at the American Astronomical Society’s Division for Planetary Science Meeting in Tucson, Arizona.
Written by Tony Phillips
Washington, D.C. – Climate change is a global phenomenon, yet Earth scientists are keeping a wary eye on one place in particular–the Arctic.
“Polar regions are important for us to study right now,” explains Tom Wagner of NASA’s Earth Science Division in Washington DC. “They are changing rapidly.”
One of the most visible of signs of warming is the retreat of Arctic sea ice. Every year, sea ice waxes and wanes in a normal response to the changing of seasons; the annual sea ice minimum occurs near the end of northern summer. Since the 1970s, researchers carefully watched to see if the rhythm of Arctic sea ice would respond to global warming.
Written by Dr. Tony Phillips
Washington, D.C. – One of the fastest spacecraft ever built — NASA’s New Horizons — is hurtling through the void at nearly one million miles per day. Launched in 2006, it has been in flight longer than some missions last, and it is nearing its destination: Pluto.
“The encounter begins next January,” says Alan Stern, of the Southwest Research Institute and the mission’s principal investigator. “We’re less than a year away.”
Written by Whitney Clavin
Pasadena, CA – Astronomers using data from NASA’s Kepler and Spitzer space telescopes have created the first cloud map of a planet beyond our solar system, a sizzling, Jupiter-like world known as Kepler-7b.
The planet is marked by high clouds in the west and clear skies in the east. Previous studies from Spitzer have resulted in temperature maps of planets orbiting other stars, but this is the first look at cloud structures on a distant world.
Now playing at the Movies
© 2006-2021 Clarksville, TN Online is owned and operated by residents of Clarksville Tennessee.