Space: Submission 

RIP John Glenn

https://imagine.gsfc.nasa.gov/science/toolbox/multiwavelength2.html

40 YEARS AGO TODAY: The surface of Mars, as seen by NASA’s Viking 2 lander, September 25, 1977.

The first photo of the surface of Mars, captured by NASA’s Viking 1 lander on July 20, 1976.

Solar System

via reddit

1981 NASA diagram gives a cutaway view inside a space shuttle.

Inmarsat-5 F4 successfully launched from LC-39A at Kennedy Space Center at 7:21pm EDT May 15. The Falcon 9 deployed the satellite into Geostationary Transfer Orbit 31 minutes and 48 seconds after liftoff.  Since the rocket was flying in its expandable configuration, following main engine cutoff the first stage fell into the Atlantic ocean and was not recovered.  The launch of the Inmarsat mission marked the first time SpaceX began testing countdown procedures for their next major upgrade of the Falcon 9 rocket, the Block IV. Normally, the rocket’s liquid oxygen propellant is loaded into the rocket 45 minutes before launch, ten minutes after RP-1.  For Inmarsat, the LOX was loaded 35 minutes before liftoff. The Block IV variant will see this procedure occur during every countdown. Check out or Inmarsat-5 F4 launch archive here.

P/c: SpaceX.

Got to control the cameras (minus robotics) at NASA Johnson Space Center Mission Control for today’s SpaceX Dragon capture and was 536% fangirling the entire time. 😍🌟🌎🚀🎉

happy 127 bday Mr. Hubble 💕🔭

On the occasion of astronomer Edwin Hubble’s birthday, let’s take a look at his stock in trade – galaxies. It was through his observations of these celestial wonders that Hubble changed our perception of the universe. This excerpt from NASA’s bio will give you the gist (and please note that all these galactic images are, of course, captured by the Hubble Space Telescope):

“Most astronomers of Hubble’s day thought that all of the universe — the planets, the stars seen with the naked eye and with powerful telescopes, and fuzzy objects called nebulae — was contained within the Milky Way galaxy. Our galaxy, it was thought, was synonymous with the universe.

In 1923 Hubble trained the Hooker telescope on a hazy patch of sky called the Andromeda Nebula. He found that it contained stars just like the ones in our galaxy, only dimmer. One star he saw was a Cepheid variable, a type of star with a known, varying brightness that can be used to measure distances. From this Hubble deduced that the Andromeda Nebula was not a nearby star cluster but rather an entire other galaxy, now called the Andromeda galaxy.

In the following years he made similar discoveries with other nebulae. By the end of the 1920s, most astronomers were convinced that our Milky Way galaxy was but one of millions in the universe. This was a shift in thought as profound as understanding the world was round and that it revolved around the sun.

Hubble then went one step further. By the end of that decade he had discovered enough galaxies to compare to each other. He created a system for classifying galaxies into ellipticals, spirals and barred spirals — a system called the Hubble tuning fork diagram, used today in an evolved form.

But the most astonishing discovery Hubble made resulted from his study of the spectra of 46 galaxies, and in particular of the Doppler velocities of those galaxies relative to our own Milky Way galaxy. What Hubble found was that the farther apart galaxies are from each other, the faster they move away from each other. Based on this observation, Hubble concluded that the universe expands uniformly. Several scientists had also posed this theory based on Einstein’s General Relativity, but Hubble’s data, published in 1929, helped convince the scientific community.”

You can click photos to identify the galaxies.

(Text: NASA/Images: HubbleSite)