NGC 4414: A Flocculent Spiral Galaxy
https://apod.nasa.gov/apod/image/2504/Ngc4414B_Hubble_960.jpg
How much mass do flocculent spirals hide? The featured image of flocculent spiral galaxy NGC 4414 was taken with the Hubble Space Telescope to help answer this question. Flocculent spirals -- galaxies without well-defined spiral arms -- are a quite common form of galaxy, and NGC 4414 is one of the closest. Stars and gas near the visible edge of spiral galaxies orbit the center so fast that the gravity from a large amount of unseen dark matter must be present to hold them together. Understanding the matter and dark matter distribution of NGC 4414 helps humanity calibrate the rest of the galaxy and, by deduction, flocculent spirals in general. Further, calibrating the distance to NGC 4414 helps humanity calibrate the cosmological distance scale of the entire visible universe.
Attribution:
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Box of matches
Food concentrate
50 feet of nylon rope
Parachute silk
Portable heating unit
Two .45 calibre pistols
One case of dehydrated milk
Two 100 lb tanks of oxygen
Stellar map
Self-inflating life raft
Magnetic compass
20 litres of water
Signal flares
First aid kit, including injection needles
Solar-powered FM receiver-transmitter
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Don't cheat! Internet searches are not allowed
Here's a #test we did during my last #English conversation class. It's a funny one, so I figured I could share it with you.
#NASA used it to select potential #astronauts.
You're an astronaut and your station has crashlanded on the sunny side of the #Moon.
You're in a group of 3, all alive, but the mother ship is 200 km away from your location.
Order all the 15 items in the following list (see next toot), 1 being the most important and 15 being the least important.
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After a long stop at Broom's Point, #Perseverance is back on its planned route down the northwest Jezero Crater rim. The path shown is a guess.
The map was made with #QGIS
Quickly processed, leveled NAVCAM_RIGHT mosaic
looking NNE (24°) from RMC 71.0696
Sol 1468, LMST: 12:02:55
Credit: #NASA/JPL-Caltech/65dBnoise
A drive by Perseverance rover took it to site number 71.696 during Sol 1468 (April 7, 2025). The attached roughly processed image is one of the end-of-drive navigation camera 4-tile composite images. Credits: NASA/JPL-Caltech
Importance Score: 52 / 100
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Importance Score: 72 / 100
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"Moonquakes Surprisingly Common" is #NASA #astronomy picture of the day (#APOD) - Seismometers left by Apollo crews continued to transmit #quake data for years. Data from max sensor network installation in 1972 until 1977 shows moonquakes are more common than earthquakes. One theory about why says that could be caused by tidal influence from Earth's gravity. Future lunar stations and settlements will need to plan for quakes. https://apod.nasa.gov/apod/ap250406.html #planetary #geology
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Read More: https://blog.joshuniverse.com/blue-origins-all-female-space-flight-a-complex-legacy
@science@lemmy.world @space@lemmy.world @science@lemmy.ml @space@newsmast.community @space@lemmy.ml #space #science #nasa #astronomy
Pluto at Night
Credits: #NASA, Johns Hopkins Univ./APL, Southwest Research Institute
#nature #space #astrophotography
Quite the read about Starliner's maiden trip to the #iss