Monday, November 30, 2020

APOD - Cygnus Without Stars

Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2020 November 30
See Explanation.  Moving the cursor over the image will bring up an annotated version.  Clicking on the image will bring up the highest resolution version  available.

Cygnus Without Stars
Image Credit & Copyright: Bowen James Cameron

Explanation: The sky is filled with faintly glowing gas, though it can take a sensitive camera and telescope to see it. For example, this twelve-degree-wide view of the northern part of the constellation Cygnus reveals a complex array of cosmic clouds of gas along the plane of our Milky Way galaxy. The featured mosaic of telescopic images was recorded through two filters: an H-alpha filter that transmits only visible red light from glowing hydrogen atoms, and a blue filter that transmits primarily light emitted by the slight amount of energized oxygen. Therefore, in this 18-hour exposure image, blue areas are hotter than red. Further digital processing has removed the myriad of point-like Milky Way stars from the scene. Recognizable bright nebulas include NGC 7000 (North America Nebula), and IC 5070 (Pelican Nebula) on the left with IC 1318 (Butterfly Nebula) and NGC 6888 (Crescent Nebula) on the right -- but others can be found throughout the wide field.

Tomorrow's picture: star forming cluster


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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
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More Good News For Moderna's COVID-19 Vaccine Candidate

Biotech company Moderna has new data reinforcing that its COVID-19 inoculation is safe and effective. The company is submitting an application to the FDA Monday requesting emergency use authorization.

Biotech company Moderna has new data reinforcing that its COVID-19 inoculation is safe and effective. The company is submitting an application to the FDA Monday requesting emergency use authorization.

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Sunday, November 29, 2020

APOD - Verona Rupes: Tallest Known Cliff in the Solar System

Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2020 November 29
See Explanation.  Clicking on the picture will download  the highest resolution version available.

Verona Rupes: Tallest Known Cliff in the Solar System
Image Credit: Voyager 2, NASA

Explanation: Could you survive a jump off the tallest cliff in the Solar System? Quite possibly. Verona Rupes on Uranus' moon Miranda is estimated to be 20 kilometers deep -- ten times the depth of the Earth's Grand Canyon. Given Miranda's low gravity, it would take about 12 minutes for a thrill-seeking adventurer to fall from the top, reaching the bottom at the speed of a racecar -- about 200 kilometers per hour. Even so, the fall might be survivable given proper airbag protection. The featured image of Verona Rupes was captured by the passing Voyager 2 robotic spacecraft in 1986. How the giant cliff was created remains unknown, but is possibly related to a large impact or tectonic surface motion.

Tomorrow's picture: a starless space swan


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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
NASA Official: Phillip Newman Specific rights apply.
NASA Web Privacy Policy and Important Notices
A service of: ASD at NASA / GSFC
& Michigan Tech. U.


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These Seniors Are Thriving Amid The Pandemic

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Saturday, November 28, 2020

APOD - NGC 6822: Barnard's Galaxy

Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2020 November 28
See Explanation.  Clicking on the picture will download  the highest resolution version available.

NGC 6822: Barnard's Galaxy
Image Credit & Copyright: Data - Martin Pugh, Processing - Mark Hanson

Explanation: Grand spiral galaxies often seem to get all the glory, flaunting their young, bright, blue star clusters in beautiful, symmetric spiral arms. But small galaxies form stars too, like nearby NGC 6822, also known as Barnard's Galaxy. Beyond the rich starfields in the constellation Sagittarius, NGC 6822 is a mere 1.5 million light-years away, a member of our Local Group of galaxies. A dwarf irregular galaxy similar to the Small Magellanic Cloud, NGC 6822 is about 7,000 light-years across. Brighter foreground stars in our Milky Way have a spiky appearance. Behind them, Barnard's Galaxy is seen to be filled with young blue stars and mottled with the telltale pinkish hydrogen glow of star forming regions in this deep color composite image.

Tomorrow's picture: falling off a cliff


< | Archive | Submissions | Index | Search | Calendar | RSS | Education | About APOD | Discuss | >

Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
NASA Official: Phillip Newman Specific rights apply.
NASA Web Privacy Policy and Important Notices
A service of: ASD at NASA / GSFC
& Michigan Tech. U.


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Grateful For Good Music

Here's what we're thankful for this year.