The milky way
do you know that the milky way contains over 200 billion stars, and enough dust and gas to make billions more?! and this galaxy is nothing more than a speck of dust in the vast universe. imagine how tiny we are!
this stunning shot of the milky way was captured by mark robben (@skylightphotography_ ) from joshua tree national park.
for timothée and nessa
@tchalamet [tag him if you want]
22 hours ago
Sunrise flight to the space station
orbital atk's cygnus resupply ship with its cymbal-ike ultraflex solar arrays approaches the international space station's robotic arm canadarm2 as both spacecraft fly into an orbital sunrise on nov. 14, 2017.
the cargo craft carried almost 7,400 pounds of crew supplies, science experiments, spacewalk gear, station hardware and computer parts. new research will explore the effectiveness of antibiotics on astronauts and observe how plants absorb nutrients in microgravity. other experiments will deploy cubesats to explore laser communications and hybrid solar panels.
image credit: nasa (@nasa )
Born of fire, the birth of a star is one of the most violent, yet remarkable, events in the cosmos, and it all begins in a large star forming region called a nebulae.
the image above shows the orion nebula, a large star forming region located some 1,600 light years away. within this stunning region of space, molecular hydrogen clumps together to form stars. usually due to an external force, hydrogen within a nebula clumps together to form a larger structure. as the hydrogen clumps together, its gravitational pull becomes stronger. as the hydrogen becomes compressed, its temperature begins to increase dramatically. eventually, the pressure and temperature become high enough for hydrogen nuclei in the core to fuse together. two hydrogen nuclei within the forming star come together under the immense pressures and extreme temperatures and fuse together. one of the hydrogen nuclei (a proton) undergoes a decay process called beta+ decay. one of the protons decays into a neutron, and releases a positron and a neutrino in the process. we now have a deuterium nuclei, containing one proton and one neutron. this deuterium then fuses with another hydrogen nuclei, forming a helium-3 nuclei and releasing a gamma photon in the process. the helium-3 nuclei then fuses with another helium-3 nuclei. during this step, two hydrogen nuclei are released, leaving us with a helium-4 nuclei. this proton-proton chain results in the fusion of hydrogen into helium. this fusion process gives off a tremendous amount of energy that powers the star.