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Peter Erwin's user avatar
Peter Erwin's user avatar
Peter Erwin's user avatar
Peter Erwin
  • Member for 9 years
  • Last seen this week
  • Munich, Germany
6 votes
Accepted

Has earthshine in fact increased since lights (say 1900); that is to say can we measure or has there been a measurable increase? What are the numbers?

6 votes
Accepted

How is dark matter distributed within our solar system?

6 votes
Accepted

Is the universe macroscopically transparent to CMB? Is the fraction intercepted by stars and dust so tiny that it doesn't have a correction factor?

6 votes

Could it be that Universe is rotating while expanding?

6 votes
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How to extract galaxy spectra for different radii in Python for spectra taken by long slit spectrograph?

6 votes
Accepted

When was H-alpha first used to observe the universe?

6 votes

What is the density of stars in our region of the galaxy, up to say, 1000 light years distant?

6 votes
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How do they keep lights from guided lasers in adaptive optics from interfering with the image?

6 votes
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Why did supernova 1987A's "String of 'Cosmic Pearls'" appear to be so lumpy 20 years later? Is it still?

6 votes
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How will they know when to start taking the picture of the black hole at the center of the Milky Way?

6 votes
Accepted

Do Astronomers really never call Lagrangian points "libration points"?

6 votes
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How exactly will DESI simultaneously capture individual spectra from 5,000 galaxies using optical fibers?

6 votes
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Why is there free magnesium in the ecliptic (if there is) and why would some be orbiting within the ecliptic plane but retrograde?

6 votes

What percentage of a spiral galaxy is the center/bulge?

6 votes

Will all galaxies eventually become elliptical galaxies?

6 votes
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Has Hubble ever been used to try to image a near Earth asteroid?

6 votes
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Why is this Einstein ring pink?

6 votes
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How much difference did the supply of "fresh" r-process elements make to the Solar System.?

5 votes
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Why a blue spot in some hubble images of NGC 4302?

5 votes

Is there a far away probe that has recorded the light spectrum from Earth as if it were an exoplanet?

5 votes
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How can I obtain raw observation data of stars surrounding Sgr A*?

5 votes

Can't pulsars and stars be used for gravitational wave measurement?

5 votes
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Did Hubble see a pair of UFOs? (Identify this artifact)

5 votes
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How are galactic rotation curves determined from radial velocity measurements?

5 votes
Accepted

Why does Nancy Grace Roman = 100 × Hubble? Why is the new space telescopes wide field camera so much wider than the old one's?

5 votes

On the lack of observational records by European astronomers of the 1054 guest star

5 votes
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Is our central black hole actually at the CG of the galaxy?

5 votes

How to calculate the limiting magnitude of Hubble?

5 votes

Why is Sagittarius A* called so?

5 votes

Optical Observation Calls: How and Where to apply for optical observations?

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