lunes, 23 de abril de 2018
jueves, 11 de agosto de 2016
lunes, 1 de febrero de 2016
U.S. Chief Technology Officer
martes, 22 de septiembre de 2015
Heading into the unknown…
Almost everything we know about living in space ends at six months. Now that I am at the midpoint of my mission, heading into the second half of one year in space aboard the International Space Station, I am looking forward to exploring the science of this uncharted territory and stepping into the unknown.
My Russian colleague Mikhail Kornienko and I are living in space for one year to push the edge of our scientific understanding. To add in another dynamic, researchers are conducting “twin studies” to compare the subtle effects and changes in spaceflight as compared to Earth by studying my twin brother and I, two individuals who have almost identical genetics, but are in different environments for one year. We hope that the knowledge gained on this mission will benefit the Earth and that the data collected will help send humans to new destinations, supporting the next generation of space exploration.
Whether it is living in low Earth orbit for one year or a two year mission to the Red Planet, I have learned that human potential is limitless and we should never stop pushing the boundaries of exploration.
Thank you for supporting me and joining me on this mission. I am posting on social media with the hope that I can bring all of you on Earth along for the ride. I want to inspire you to reach further for your dreams and know that anything is possible.
The people who make International Space Station operations possible, the flight controllers watching over our ship 24-7-365, and the researchers analyzing the data we get back have invested their careers and lives to this mission to serve the United States and inspire the next generation.
I have traveled 72 million miles around Earth in the past 171 days -- flying at 17,500mph -- and have had the opportunity to experience our home planet from an incredible perspective. When I come home in March, I will have orbited the Earth 5,472 times traveling 141.7 million statute miles and spent more time in space than any U.S. astronaut in history. Please join me for the next six months of my mission -- as I reach these milestones and continue NASA’s work off the Earth, for the Earth.
NASA astronaut Scott Kelly takes a selfie with the Bahamas from 250 miles above Earth aboard the International Space Station.
Please continue to follow the mission at www.nasa.gov/station and on social media at @StationCDRKelly on Twitter and Instagram, NASA Astronaut Scott Kelly on Facebook and using #YearInSpace.
Sincerely,
Scott
Scott Kelly
NASA Astronaut
jueves, 4 de junio de 2015
I'm the President's Chief Science Advisor. And from time to time, I like to send quick, ad-hoc notes to White House staff on a variety of topics -- upcoming lunar eclipses, groundbreaking climate news, incredible photos from space. Things I've come across and found fascinating.
Apparently, people really like them. So when a colleague recently suggested I start sending these notes a little more widely, I figured I'd give it a try.
Here's what I passed along internally Monday morning:
Today's morning report from NASA contains a Hubble photo I thought worth sharing. The astonishing density of stars -- most of which, we now know, have planets -- really does make one wonder whether there's anybody else out there. And this is just one piece of our own galaxy. There are an estimated 100 billion other galaxies in the observable universe. Enjoy!
Even if I don't know the answer, we've got a lot of smart people over here who might.
My best,
John
Dr. John P. Holdren
Director, Office of Science and Technology Policy
The White House
@whitehouseostp
Hubble Peers into the Most Crowded Place in the Milky Way
This NASA/ESA Hubble Space Telescope image presents the Arches Cluster, the densest known star cluster in the Milky Way. It is located about 25,000 light-years from Earth in the constellation of Sagittarius (The Archer), close to the heart of our galaxy, the Milky Way. It is, like its neighbor the Quintuplet Cluster, a fairly young astronomical object at between two and four million years old. The Arches cluster is so dense that in a region with a radius equal to the distance between the sun and its nearest star there would be over 100,000 stars! At least 150 stars within the cluster are among the brightest ever discovered in the Milky Way.
These stars are so bright and massive that they will burn their fuel within a short time (on a cosmological scale that means just a few million years). Then they will die in spectacular supernova explosions. Due to the short lifetime of the stars in the cluster the gas between the stars contains an unusually high amount of heavier elements, which were produced by earlier generations of stars.