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Peter Erwin's user avatar
Peter Erwin's user avatar
Peter Erwin's user avatar
Peter Erwin
  • Member for 8 years, 11 months
  • Last seen this week
  • Munich, Germany
66 votes

Where do we have it from that the Moon is migrating away from Earth?

60 votes
Accepted

Is oxygen really the most abundant element on the surface of the Moon?

53 votes
Accepted

Is Earth's Surface "In orbit"?

43 votes
Accepted

Are there observable changes in a star about to become supernova, minutes or hours before the explosion?

43 votes
Accepted

Are there any old/ancient star maps that we can compare to today’s and see drastic differences?

25 votes
Accepted

Is it possible that the Sun and all the nearby stars formed from the same nebula?

18 votes
Accepted

Why isn't most hydrogen in the universe molecular (diatomic), instead of atomic (monoatomic)?

18 votes

What telescope is Polish astronomer Kazimierz Kordylewski holding in this April 1964 photo at the Jagiellonian University Observatory in Krakow?

18 votes
Accepted

Which are stars and which are noise in this comet photo?

15 votes

Why is Starlink polluting the night sky a big concern if we have space telescopes?

13 votes

How can the (in my eyes quite ridiculous) conjecture of Sheldrake be disproven?

13 votes
Accepted

Is a kilonova bigger than a supernova?

13 votes
Accepted

Why aren't ground-based observatories using adaptive optics for visible wavelengths (circa 2016)?

13 votes

Conventional matter to dark matter ratio, outside of galaxies

12 votes

What is the name of our Solar System?

12 votes
Accepted

What are the chances of a star colliding with another during a galactic collision?

12 votes

How does a galaxy in Abell 2261 exist without a black hole in the center?

12 votes
Accepted

Calculate the true diameter of stars from photographic plate

12 votes
Accepted

Radius to which all hydrogen-burning stars are known?

12 votes
Accepted

Did this satellite streak past the Hubble Space Telescope so close that it was out of focus? If so, how close was it?

11 votes
Accepted

Are Brown and Sub-Brown Dwarfs secretly more common than stars?

10 votes

How do astronomers know that distant galaxies aren't actually nearby star clusters?

10 votes
Accepted

What is the application of pseudorandomness in astrophysics?

10 votes
Accepted

Has Hubble photographed Venus in near IR? If so how does it compare to the new and exciting Parker Solar Probe image?

10 votes
Accepted

Using masers to measure rotational velocity of a galaxy

10 votes
Accepted

Question: By design, JWST cannot observe in the anti-sun direction. Is this due to Gegenschein backscatter?

10 votes
Accepted

Is the Sun "chemically peculiar", and if not why is HD 222925?

10 votes

Can "rogue" supermassive black holes be made this way?

10 votes
Accepted

What is the "lost light" in this unusual Hubble Deep Sky image?

10 votes
Accepted

What cluster of stars is this with a "dark donut" to one side?

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