Astronomy and Astrophysics Forum

Post thread
Join in expert discussion on the topics of Astronomy and astrophysics. This may include discussion on celestial objects, space, and the physical universe as a whole. Mainstream science only.
B What is the true density of the Asteroid Belt?
  • · Replies 17 ·
Replies
17
Views
3K
I How big will the Betelgeuse supernova appear?
  • · Replies 8 ·
Replies
8
Views
2K
I If Ouamuamua were a propelled lightsail, wouldn't we have detected it?
  • · Replies 6 ·
Replies
6
Views
1K
B Dark Matter -- Is it possible that Dark Matter has Planck mass and Spin two?
  • · Replies 13 ·
Replies
13
Views
2K
Stargazing Can distance in space be measured by human systems?
  • · Replies 22 ·
Replies
22
Views
3K
B Trying to understand the differences between distant & local galaxies
  • · Replies 5 ·
Replies
5
Views
2K
I Solar System Diameter: Calculating Distances & Multi-Star Systems
  • · Replies 2 ·
Replies
2
Views
2K
B Is the Universe Expanding Due to Spinning?
  • · Replies 9 ·
Replies
9
Views
2K
I Can Einstein-Chwolson rings be observed from a telescope on Earth?
  • · Replies 5 ·
Replies
5
Views
2K
B Darkest Place on the Surface of the Earth
  • · Replies 8 ·
Replies
8
Views
2K
A Life supported by radiation from the accretion disk of a black hole
  • · Replies 1 ·
Replies
1
Views
2K
B When does the perspective from the cockpit of a spaceship change?
  • · Replies 30 ·
2
Replies
30
Views
3K
B Trace methane in Uranus and Neptune, condensing into diamonds
  • · Replies 2 ·
Replies
2
Views
2K
I Do stars in the ecliptic seasonally change brightness?
  • · Replies 13 ·
Replies
13
Views
1K
Stargazing Is this USB eyepiece camera a lemon?
  • · Replies 26 ·
Replies
26
Views
4K
B Meteor Photographed by Accident: Spectacular Green Bolide
  • · Replies 11 ·
Replies
11
Views
2K
B Creation and distribution of elements - looking for recommendations
  • · Replies 2 ·
Replies
2
Views
1K
I Was the Ancient Universe More Compact Between 12,000 BC and 400 BC?
  • · Replies 9 ·
Replies
9
Views
2K
B Are Most Star Systems Composed Mainly of Light Elements?
  • · Replies 3 ·
Replies
3
Views
1K
B Will You Capture Jupiter and Saturn's Historic Conjunction?
  • · Replies 28 ·
Replies
28
Views
4K
B Earth & Moon Gravity Gradient: Investigating Its Impact
  • · Replies 33 ·
2
Replies
33
Views
5K
I Infrared energy flux from the Moon
  • · Replies 7 ·
Replies
7
Views
2K
How Does Space Travel Affect Natural Aging?
  • · Replies 4 ·
Replies
4
Views
2K
B Nature: "A massive white-dwarf merger product before final collapse"
  • · Replies 1 ·
Replies
1
Views
3K
B Are subspaces of Hilbert space real?
  • · Replies 7 ·
Replies
7
Views
1K
I Transparency of a gas compared to a plasma
  • · Replies 18 ·
Replies
18
Views
2K
B Can iron form via processes like the r- or s-process?
  • · Replies 5 ·
Replies
5
Views
2K
B Where do the electrons go? (in stellar nuclear fusion)
  • · Replies 4 ·
Replies
4
Views
2K
I Gravitational lensing: deriving magnification of lensed image
  • · Replies 2 ·
Replies
2
Views
2K
B Snapped Cable Damages Arecibo Observatory Radio Telescope
  • · Replies 5 ·
Replies
5
Views
2K
I How is Adaptive Optics Revolutionizing Our Understanding of the Galactic Center?
  • · Replies 1 ·
Replies
1
Views
1K
Stargazing What do stars actually look like from up close?
  • · Replies 2 ·
Replies
2
Views
3K
B Question about things moving through outer space
  • · Replies 27 ·
Replies
27
Views
4K
I Blackbody colour of metals versus stars
  • · Replies 27 ·
Replies
27
Views
3K
I What are the Characteristics of a Perfect Meteorite?
  • · Replies 17 ·
Replies
17
Views
4K
I Matter leaving a spinning galaxy
  • · Replies 13 ·
Replies
13
Views
2K
I Astronomy in a Simple Solar System
  • · Replies 122 ·
5
Replies
122
Views
9K
B Question about Planck's Function
  • · Replies 1 ·
Replies
1
Views
1K
I Could Planck Stars Explain Black Hole Bounce and Resolve Physics Paradoxes?
  • · Replies 1 ·
Replies
1
Views
2K
What is a dynamic spectrum measurement?
  • · Replies 1 ·
Replies
1
Views
1K
Is the Universe Undergoing an Infinite Series of Expansions and Contractions?
  • · Replies 1 ·
Replies
1
Views
3K
How to calculate Helium lensing
  • · Replies 1 ·
Replies
1
Views
2K
B What causes orbits to be inclined?
  • · Replies 5 ·
Replies
5
Views
1K
B Does Jupiter have an angular momentum problem?
  • · Replies 23 ·
Replies
23
Views
2K
I Some questions about absorption lines
  • · Replies 4 ·
Replies
4
Views
2K
B Question about the s-process and r-process in stellar evolution
  • · Replies 11 ·
Replies
11
Views
2K
I At what wavelength do we observe ionized gas?
  • · Replies 1 ·
Replies
1
Views
1K
B Nervous about James Webb Space Telescope?
  • · Replies 23 ·
Replies
23
Views
3K
I Can a Tube Launch System Harness Atmospheric Energy to Reach Space?
  • · Replies 34 ·
2
Replies
34
Views
5K
B Pair Instability Supernovae & Electron Capture Supernovae
  • · Replies 2 ·
Replies
2
Views
2K
B Earth's Hubble velocity and measuring Hubble at large distances
  • · Replies 5 ·
Replies
5
Views
2K
B Help in explaining a question on gravity
  • · Replies 7 ·
Replies
7
Views
1K
I Do we first determine the gravity or density of a celestial object?
  • · Replies 1 ·
Replies
1
Views
1K
B Star at black hole event horizon
  • · Replies 8 ·
Replies
8
Views
2K
Orbital shutter as a beacon for interstellar communication
  • · Replies 4 ·
Replies
4
Views
1K
How you add gauge groups to spacetime
  • · Replies 2 ·
Replies
2
Views
2K
B The composition of interstellar dust
  • · Replies 11 ·
Replies
11
Views
3K
I Acquiring a Small Dataset of a pulsar signal
  • · Replies 3 ·
Replies
3
Views
2K
I Determining Relative Position of Space Object to Earth
  • · Replies 3 ·
Replies
3
Views
3K
B Why is Carbon considered volatile?
  • · Replies 5 ·
Replies
5
Views
2K
I Fast Radio Bursts (FBR) detected in our own Galaxy
  • · Replies 7 ·
Replies
7
Views
2K
The International Space Station as a Human Abode
  • · Replies 1 ·
Replies
1
Views
1K
NASA discovers water on the moon
  • · Replies 21 ·
Replies
21
Views
6K
A Average of the power spectrum of Poisson noise
  • · Replies 1 ·
Replies
1
Views
2K
I Fourier Series and Cepheid Variables
  • · Replies 40 ·
2
Replies
40
Views
5K
I Shape of Dark Matter Halos & Visible Matter Angular Momentum
  • · Replies 3 ·
Replies
3
Views
2K
B How does the observable Universe have meaning?
  • · Replies 25 ·
Replies
25
Views
4K
I What Mechanism Creates the Jet Emanating From a Quasar?
  • · Replies 26 ·
Replies
26
Views
3K
I Earth's Rotation & Orbit: Effects on Space Objects?
  • · Replies 1 ·
Replies
1
Views
2K
I Can Alfvén waves be observed on a stellar spectrum using amateur equipment?
  • · Replies 1 ·
Replies
1
Views
1K
Closed vs. Open Crawlspace & Automatic Vents vs. Dehumidifer?
  • · Replies 10 ·
Replies
10
Views
3K
Biological Agent Phosphine Found on Venus
  • · Replies 54 ·
2
Replies
54
Views
5K
I Book to study the big bang theory
  • · Replies 1 ·
Replies
1
Views
2K
I Number of known asteroids reaches 1 million
  • · Replies 10 ·
Replies
10
Views
5K
I Huge Hole Found in the Universe
  • · Replies 38 ·
2
Replies
38
Views
6K
Stargazing What are some good beginner telescopes for under £100?
  • · Replies 11 ·
Replies
11
Views
4K
Efficiency of a heat engine in space
  • · Replies 4 ·
Replies
4
Views
2K
I How fast do galaxies 1 billion light-years away move away from us?
  • · Replies 2 ·
Replies
2
Views
2K
I Q: Volume of the largest ellipsoid in space which contains no stars?
  • · Replies 2 ·
Replies
2
Views
2K
I What happens to a small star after burning all of its fuel?
  • · Replies 3 ·
Replies
3
Views
1K
B Some historic remarks on astrometry by Terence Tao
  • · Replies 2 ·
Replies
2
Views
1K
I IRAS Filter Profile: Computing ##\lambda_{mean}##
  • · Replies 4 ·
Replies
4
Views
985
B Phys.org - Carbon creation finding set to rock astrophysics
  • · Replies 1 ·
Replies
1
Views
2K
I Preprocessing FIT Files to Bias and Flat Correction Using Python Script
  • · Replies 7 ·
Replies
7
Views
2K
I Black Hole Event Horizon Hypothesis
  • · Replies 6 ·
Replies
6
Views
2K
I Which will be brighter when it supernovas - Eta Carinae or Betelgeuse?
  • · Replies 2 ·
Replies
2
Views
2K
I Do Black Holes Exist? | Physics & Stephen Hawking
  • · Replies 4 ·
Replies
4
Views
3K
B Why is an inverse logarithmic scale chosen for the magnitudes of stars?
  • · Replies 3 ·
Replies
3
Views
3K
Stargazing Observations and telescope/microscope design questions
  • · Replies 5 ·
Replies
5
Views
2K
I Can LIGO Detect Gravity Waves from Directly Above or Below?
  • · Replies 2 ·
Replies
2
Views
1K
I Red shift / Blue Shift - Gravity Well Roundtrip
  • · Replies 2 ·
Replies
2
Views
2K
B What is the relative speed of two groups of quasars with different redshifts?
  • · Replies 2 ·
Replies
2
Views
2K
I Apparent distance to far galaxies
  • · Replies 2 ·
Replies
2
Views
2K
B There's Gold in Them Neutron Stars - or - Maybe Not
  • · Replies 5 ·
Replies
5
Views
5K
I Object in or out of a circular field of view? (celestial coordinate system)
  • · Replies 4 ·
Replies
4
Views
2K
B If a coronal ejection like this happened during a total eclipse ....
  • · Replies 11 ·
Replies
11
Views
2K
I Is a Robust Estimate of Tau Ceti 'f' Albedo Possible?
  • · Replies 3 ·
Replies
3
Views
1K
I Rotation rates of planets seem odd?
  • · Replies 10 ·
Replies
10
Views
2K
B Measuring distance between two stars in a binary system
  • · Replies 10 ·
Replies
10
Views
5K
B Is there a forum where people can share and discuss features on Mars?
  • · Replies 56 ·
2
Replies
56
Views
5K