Bill Nye explains the basics of a solar eclipses, the path of totality, and how to safely view a solar eclipse with National Park Ranger Coral O’Riley.
Bill Nye loves syzygy and Dr. Ashwin Vasavada from JPL talks about a curious eclipse on Mars
Bill Nye explains how to see the Milky Way after a solar eclipse and Dr. Tyler Nordgren shows an ancient eclipse petroglyph.
Here is the latest Space to Ground weekly report from NASA on activities related to the International Space Station:
Here are a couple more videos released this week by NASA starting with astronaut/molecular biologist Kate Rubins talking about the benefits of ISS research into the biological effects of very low gravity:
Astronauts on the International Space Station have to exercise for two hours every day, but they can show off the hardware in a lot less time than that. In this “SpeedyTime” segment Expedition 52 flight engineer Peggy Whitson gives us a rapid-fire display of exercises that can be done with just one piece of equipment, the Advanced Resistive Exercise Device in the Tranquility module.
The most prominent item for sale was the Apollo 11 Contingency Lunar Sample Return bag, which was used by Neil Armstrong on the Apollo 11 mission to hold some samples gather soon after landing in case there was a problem and they had to leave the Moon in a hurry. The bag material is embedded wit lunar dust. The collectSPACE article recounts the interesting tale of how the bag, which was once sold for $995, ended up on the auction block and sold for $1,812,500.
Some other items also went for significant amounts:
After the lunar sample return bag, the next highest amount commanded by the 173 lots Sotheby’s auctioned Thursday was $275,000 for the flown flight plan used by the crew on the 1970 Apollo 13 mission.
Nice to see that the Chesley Bonestell illustration for a Wernher von Braun book went for $125,000.
[] “Stone Architecture on Mars, Demonstrating Mars’ Two-Thirds Less Gravity than Earth’s”- Chesley Bonestell. “10½ by 11 inch oil on artist’s board, signed “Chesley Bonestell” lower right. Verso stamped “Chesley Bonestell”, titled on verso in pen in Bonestell’s hand, with additional pencil notation reading “In 1985 I realized that the columns should be 1¾ times thicker (measure closest col. at base) than they are in the ptg.”
July 1969. It’s a little over eight years since the flights of Gagarin and Shepard, followed quickly by President Kennedy’s challenge to put a man on the moon before the decade is out.
It is only seven months since NASA’s made a bold decision to send Apollo 8 all the way to the moon on the first manned flight of the massive Saturn V rocket.
Now, on the morning of July 16, Apollo 11 astronauts Neil Armstrong, Buzz Aldrin and Michael Collinssit atop another Saturn V at Launch Complex 39A at the Kennedy Space Center. The three-stage 363-foot rocket will use its 7.5 million pounds of thrust to propel them into space and into history.
At 9:32 a.m. EDT, the engines fire and Apollo 11 clears the tower. About 12 minutes later, the crew is in Earth orbit. (› Play Audio)
After one and a half orbits, Apollo 11 gets a “go” for what mission controllers call “Translunar Injection” – in other words, it’s time to head for the moon. Three days later the crew is in lunar orbit. A day after that, Armstrong and Aldrin climb into the lunar module Eagle and begin the descent, while Collins orbits in the command module Columbia. (› View Flash Feature)
Collins later writes that Eagle is “the weirdest looking contraption I have ever seen in the sky,” but it will prove its worth.
When it comes time to set Eagle down in the Sea of Tranquility, Armstrong improvises, manually piloting the ship past an area littered with boulders. During the final seconds of descent, Eagle’scomputer is sounding alarms.
It turns out to be a simple case of the computer trying to do too many things at once, but as Aldrin will later point out, “unfortunately it came up when we did not want to be trying to solve these particular problems.”
When the lunar module lands at 4:18 p.m EDT, only 30 seconds of fuel remain. Armstrong radios “Houston, Tranquility Base here. The Eagle has landed.” Mission control erupts in celebration as the tension breaks, and a controller tells the crew “You got a bunch of guys about to turn blue, we’re breathing again.” (› Play Audio)
Armstrong will later confirm that landing was his biggest concern, saying “the unknowns were rampant,” and “there were just a thousand things to worry about.”
This photograph of the Lunar Module at Tranquility Base was taken by Neil Armstrong during the Apollo 11 mission, from the rim of Little West Crater on the lunar surface. Armstrong’s shadow and the shadow of the camera are visible in the foreground. When he took this picture, Armstrong was clearly standing above the level of the Lunar Module’s footpads. Darkened tracks lead leftward to the deployment area of the Early Apollo Surface Experiments Package (EASEP) and rightward to the TV camera. This is the furthest distance from the lunar module traveled by either astronaut while on the moon. View a panorama of this image
At 10:56 p.m. EDT Armstrong is ready to plant the first human foot on another world. With more than half a billion people watching on television, he climbs down the ladder and proclaims: “That’s one small step for a man, one giant leap for mankind.” (› Play Audio)
Aldrin joins him shortly, and offers a simple but powerful description of the lunar surface: “magnificent desolation.” They explore the surface for two and a half hours, collecting samples and taking photographs.
They leave behind an American flag, a patch honoring the fallen Apollo 1 crew, and a plaque on one of Eagle’s legs. It reads, “Here men from the planet Earth first set foot upon the moon. July 1969 A.D. We came in peace for all mankind.”
Armstrong and Aldrin blast off and dock with Collins in Columbia. Collins later says that “for the first time,” he “really felt that we were going to carry this thing off.”
The crew splashes down off Hawaii on July 24. Kennedy’s challenge has been met. Men from Earth have walked on the moon and returned safely home.
In an interview years later, Armstrong praises the “hundreds of thousands” of people behind the project. “Every guy that’s setting up the tests, cranking the torque wrench, and so on, is saying, man or woman, ‘If anything goes wrong here, it’s not going to be my fault.'” (› Read 2001 Interview, 172 Kb PDF)
In a post-flight press conference, Armstrong calls the flight “a beginning of a new age,” while Collins talks about future journeys to Mars.
Over the next three and a half years, 10 astronauts will follow in their footsteps. Gene Cernan, commander of the last Apollo mission leaves the lunar surface with these words: “We leave as we came and, God willing, as we shall return, with peace, and hope for all mankind.”
When the Hubble Space Telescope observed Mars near opposition in May, 2016, a sneaky companion photobombed the picture. Phobos, the Greek personification of fear, is one of two tiny moons orbiting Mars. In 13 exposures over 22 minutes, Hubble captured a timelapse of Phobos moving through its 7-hour 39-minute orbit. Credits: NASA’s Goddard Space Flight Center
The sharp eye of NASA’s Hubble Space Telescope has captured the tiny moon Phobos during its orbital trek around Mars. Because the moon is so small, it appears star-like in the Hubble pictures.
Over the course of 22 minutes, Hubble took 13 separate exposures, allowing astronomers to create a time-lapse video showing the diminutive moon’s orbital path. The Hubble observations were intended to photograph Mars, and the moon’s cameo appearance was a bonus.
A football-shaped object just 16.5 miles by 13.5 miles by 11 miles, Phobos is one of the smallest moons in the solar system. It is so tiny that it would fit comfortably inside the Washington, D.C. Beltway.
The little moon completes an orbit in just 7 hours and 39 minutes, which is faster than Mars rotates. Rising in the Martian west, it runs three laps around the Red Planet in the course of one Martian day, which is about 24 hours and 40 minutes. It is the only natural satellite in the solar system that circles its planet in a time shorter than the parent planet’s day.
About two weeks after the Apollo 11 manned lunar landing on July 20, 1969, NASA’s Mariner 7 flew by the Red Planet and took the first crude close-up snapshot of Phobos. On July 20, 1976 NASA’s Viking 1 lander touched down on the Martian surface. A year later, its parent craft, the Viking 1 orbiter, took the first detailed photograph of Phobos, revealing a gaping crater from an impact that nearly shattered the moon.
Phobos was discovered by Asaph Hall on August 17, 1877 at the U.S. Naval Observatory in Washington, D.C., six days after he found the smaller, outer moon, named Deimos. Hall was deliberately searching for Martian moons.
Both moons are named after the sons of Ares, the Greek god of war, who was known as Mars in Roman mythology. Phobos (panic or fear) and Deimos (terror or dread) accompanied their father into battle.
Close-up photos from Mars-orbiting spacecraft reveal that Phobos is apparently being torn apart by the gravitational pull of Mars. The moon is marred by long, shallow grooves that are probably caused by tidal interactions with its parent planet. Phobos draws nearer to Mars by about 6.5 feet every hundred years. Scientists predict that within 30 to 50 million years, it either will crash into the Red Planet or be torn to pieces and scattered as a ring around Mars.
Orbiting 3,700 miles above the Martian surface, Phobos is closer to its parent planet than any other moon in the solar system. Despite its proximity, observers on Mars would see Phobos at just one-third the width of the full moon as seen from Earth. Conversely, someone standing on Phobos would see Mars dominating the horizon, enveloping a quarter of the sky.
From the surface of Mars, Phobos can be seen eclipsing the sun. However, it is so tiny that it doesn’t completely cover our host star. Transits of Phobos across the sun have been photographed by several Mars-faring spacecraft.
The origin of Phobos and Deimos is still being debated. Scientists concluded that the two moons were made of the same material as asteroids. This composition and their irregular shapes led some astrophysicists to theorize that the Martian moons came from the asteroid belt.
However, because of their stable, nearly circular orbits, other scientists doubt that the moons were born as asteroids. Such orbits are rare for captured objects, which tend to move erratically. An atmosphere could have slowed down Phobos and Deimos and settled them into their current orbits, but the Martian atmosphere is too thin to have circularized the orbits. Also, the moons are not as dense as members of the asteroid belt.
Phobos may be a pile of rubble that is held together by a thin crust. It may have formed as dust and rocks encircling Mars were drawn together by gravity. Or, it may have experienced a more violent birth, where a large body smashing into Mars flung pieces skyward, and those pieces were brought together by gravity. Perhaps an existing moon was destroyed, reduced to the rubble that would become Phobos.
Hubble took the images of Phobos orbiting the Red Planet on May 12, 2016, when Mars was 50 million miles from Earth. This was just a few days before the planet passed closer to Earth in its orbit than it had in the past 11 years.
The Hubble Space Telescope is a project of international cooperation between NASA and ESA (European Space Agency). NASA’s Goddard Space Flight Center in Greenbelt, Maryland, manages the telescope. The Space Telescope Science Institute (STScI) in Baltimore, Maryland, conducts Hubble science operations. STScI is operated for NASA by the Association of Universities for Research in Astronomy, Inc., in Washington, D.C.
While photographing Mars, NASA’s Hubble Space Telescope captured a cameo appearance of the tiny moon Phobos on its trek around the Red Planet. Discovered in 1877, the diminutive, potato-shaped moon is so small that it appears star-like in the Hubble pictures. Phobos orbits Mars in just 7 hours and 39 minutes, which is faster than Mars rotates. The moon’s orbit is very slowly shrinking, meaning it will eventually shatter under Mars’ gravitational pull, or crash onto the planet. Hubble took 13 separate exposures over 22 minutes to create a time-lapse video showing the moon’s orbital path.
For images and more information about Hubble, visit:
