Astronomy, Astrophysics, Cosmology Forum

Post thread
Join in expert discussion on the topics of Astronomy, astrophysics and cosmology. This may include discussion on celestial objects, space, and the physical universe as a whole. Mainstream science only.
Undergrad I'm not sure where to start with very basic cosmology
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Uncovering the Reality of Dark Matter in Published Space Maps
  • · Replies 7 ·
Replies
7
Views
1K
Undergrad Q: Personal magnetic fields: Protection from space radiation
  • · Replies 6 ·
Replies
6
Views
2K
Graduate The age of the Universe in a denser region of TimeSpace
  • · Replies 9 ·
Replies
9
Views
2K
Graduate Does multiverse really explain fine-tuning?
  • · Replies 57 ·
2
Replies
57
Views
8K
Graduate Reappearance of matter from a horizon
  • · Replies 11 ·
Replies
11
Views
2K
Graduate Can the Universe's Acceleration be Measured in m/s^2 Instead of m/s/pc?
  • · Replies 5 ·
Replies
5
Views
2K
Graduate The Impact of Cosmological Expansion on the Planck Length: A Quantum Perspective
  • · Replies 15 ·
Replies
15
Views
3K
Graduate Total mass-energy v nature of forces, particles
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Help with Aladin Contrast for Galaxies, Stars & Planets
  • · Replies 7 ·
Replies
7
Views
3K
Simulation of New Horizons arrival day at Pluto
  • · Replies 6 ·
Replies
6
Views
4K
Undergrad Elliptical Orbit of Sun Around Milky Way
  • · Replies 5 ·
Replies
5
Views
3K
Will Humans ever completely understand the universe?
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Homogeneity and isotropy in Big Bang model
  • · Replies 15 ·
Replies
15
Views
3K
Graduate LCDM Model best value of ##Ω_k##
  • · Replies 9 ·
Replies
9
Views
2K
High School A little solar activity this week
  • · Replies 2 ·
Replies
2
Views
4K
Undergrad Confusion About the Physics of Orbiting Bodies
  • · Replies 10 ·
Replies
10
Views
3K
Undergrad Blackbody Radiation and the Inverse Square Law
  • · Replies 14 ·
Replies
14
Views
4K
Graduate Cosmic acoustics -- why no intermediate waves on CMB map
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad Beginning of Time: Hawking vs Greene
  • · Replies 13 ·
Replies
13
Views
3K
Undergrad Can time exist without space and vice versa
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Understanding the Relationship Between Baryonic and Dark Matter in the Universe
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Implications of SMBH Entropy on DM
  • · Replies 2 ·
Replies
2
Views
2K
High School Big Bang vs Black Hole: What Triggered the Expansion?
  • · Replies 13 ·
Replies
13
Views
4K
Graduate IceCube sees astrophysical neutrinos
  • · Replies 7 ·
Replies
7
Views
2K
A shot I got of Jupiter & moons last night
  • · Replies 13 ·
Replies
13
Views
3K
Graduate Is the CMB Data Showing that We are the Center of the Universe?
  • · Replies 7 ·
Replies
7
Views
5K
Undergrad If the universe is a simulation, on what does it run?
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Are We an Early Intelligent Species in the Universe?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Interaction Between Light and Black Holes
  • · Replies 10 ·
Replies
10
Views
3K
Undergrad Traveling to space aging more slowly is true?
  • · Replies 11 ·
Replies
11
Views
3K
High School Does Space Really Contain Nothing?
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Over what scale is curvature measurable
  • · Replies 4 ·
Replies
4
Views
2K
RIP Jacob Bekenstein (Black Hole Entropy)
  • · Replies 4 ·
Replies
4
Views
1K
Graduate How Does the Casimir Force Relate to the Expansion of the Universe?
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad How do we know galaxies are exactly where we see them?
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad Minimum possible warning for deadly comet/asteroid
  • · Replies 8 ·
Replies
8
Views
2K
High School How to convert Ohms to luminosity?
  • · Replies 15 ·
Replies
15
Views
10K
Stargazing What is the difference between linear and angular magnitude in telescopes?
  • · Replies 9 ·
Replies
9
Views
2K
Graduate Is there an implied spherical shell mass external to the universe
  • · Replies 19 ·
Replies
19
Views
2K
Graduate Acceleration of Universe: centrifugal force?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Hydrogen/Helium Emission Spectra Temperature Dependence
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Gamma ray bursts (GRB) and distribution of life
  • · Replies 5 ·
Replies
5
Views
4K
Graduate Understanding the Metric Tensor: Definition, Equations, and Properties
  • · Replies 2 ·
Replies
2
Views
4K
Graduate How do we know everything in the universe is matter? (versus antimatter)
  • · Replies 7 ·
Replies
7
Views
2K
Graduate How is expansion manifested physically?
  • · Replies 33 ·
2
Replies
33
Views
3K
Undergrad Distances in km/s vs mega parsecs or light years
  • · Replies 9 ·
Replies
9
Views
2K
Graduate What cosmic "wind" is beign referenced?
  • · Replies 4 ·
Replies
4
Views
2K
High School Galaxies Colliding: A Rare Phenomenon in Space
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Can we use counter-rotating rings to generate power on space
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Where to start learning cosmology
  • · Replies 12 ·
Replies
12
Views
5K
Ready to Watch the Perseid Shower? Join Me for a Clear Sky Viewing!
  • · Replies 24 ·
Replies
24
Views
3K
Graduate Does Gravity Cause Heat Flow to the Center of the Earth?
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Earth mimics supernovae with TGFs. No one knows how.
  • · Replies 4 ·
Replies
4
Views
4K
Graduate Is vacuum acceleration directly proportional to distance?
  • · Replies 4 ·
Replies
4
Views
2K
High School How is the Big Bang compatible with an infinite universe?
  • · Replies 53 ·
2
Replies
53
Views
9K
Graduate How Far Can We Exclude Alien EM Broadcasts in Our Light Cone?
  • · Replies 10 ·
Replies
10
Views
2K
How big is an object in empty space?
  • · Replies 19 ·
Replies
19
Views
2K
Graduate Can a micro black hole be created Past the horizon of a large black hole
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad Why isn't the Oort Cloud shaped like a disk?
  • · Replies 13 ·
Replies
13
Views
4K
Graduate Expected rate of change, if at all, of nature's constants
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Is This Equation Accurate for Determining the Size of the Universe?
  • · Replies 6 ·
Replies
6
Views
2K
High School Solar day and the amount of Earth's rotation
  • · Replies 5 ·
Replies
5
Views
3K
Graduate What is the edge of the universe and what lies beyond?
  • · Replies 4 ·
Replies
4
Views
2K
High School Questions regarding to the Accelerating universe from Novice
  • · Replies 9 ·
Replies
9
Views
2K
Graduate Explore the Too-Big-to-Fail Problem: A Comprehensive Assessment
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Primordial gravitational wave constraints from Planck 2015
  • · Replies 4 ·
Replies
4
Views
2K
Graduate How many Hubble Spheres are in the universe?
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Is the Universe Flatter Than We Thought?
  • · Replies 2 ·
Replies
2
Views
2K
Physical cosmology learning sites
  • · Replies 4 ·
Replies
4
Views
1K
Graduate Why Can't We See Beyond the Cosmic Horizon Despite Observing the Oldest Light?
  • · Replies 6 ·
Replies
6
Views
2K
Insights Approximate LCDM Expansion in Simplified Math (Part 4) - Comments
  • · Replies 14 ·
Replies
14
Views
2K
Graduate What Determines the Fate of Our Universe?
  • · Replies 9 ·
Replies
9
Views
3K
Graduate Why dark matter distribution is so different in galaxies?
  • · Replies 28 ·
Replies
28
Views
5K
Graduate Questions about black holes and wormholes
  • · Replies 12 ·
Replies
12
Views
5K
Graduate Dark Matter Primer: Overview and Updates
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Dark Matter density given specific location
  • · Replies 27 ·
Replies
27
Views
2K
Graduate Dark matter and Antimatter-matter
  • · Replies 12 ·
Replies
12
Views
3K
High School Existence of Universe: How Scientists Determine Galaxy Existence
  • · Replies 11 ·
Replies
11
Views
2K
Graduate Is dark matter distrubition always near galaxies?
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Neutron Star Questions: Answers to Max/Min Mass & More
  • · Replies 33 ·
2
Replies
33
Views
5K
Graduate Dark energy and cosmological constant
  • · Replies 11 ·
Replies
11
Views
3K
Graduate A Question Regarding Black Holes
  • · Replies 13 ·
Replies
13
Views
3K
Graduate What is math showing inflation solves horizon problem?
  • · Replies 6 ·
Replies
6
Views
3K
Graduate Is R_h=ct a more accurate cosmological model than wCDM/LCDM?
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Derivation of Gott's formula for size of observable universe
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Huge news about a huge structure
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Gravitational Influence of Stars in a Galaxy
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Thermodynamics behind the heating of Saturn's moon Enceladus
  • · Replies 17 ·
Replies
17
Views
3K
Graduate Possible Way to Measure Dark Energy?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Which field deals with this(Astronomy,Astrophysics) ?
  • · Replies 3 ·
Replies
3
Views
1K
Graduate Do the black holes have infinite mass ?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Does Black Hole Information Storage Suggest a Holographic Universe?
  • · Replies 6 ·
Replies
6
Views
3K
Graduate How we are still able to detect CMB photons?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Is the Total Energy of the Universe Really Zero?
  • · Replies 16 ·
Replies
16
Views
4K
Graduate Why is the Universe (nearly) flat?
  • · Replies 48 ·
2
Replies
48
Views
7K
Undergrad Galactic Black Holes: % & Types Explored
  • · Replies 7 ·
Replies
7
Views
2K
High School Dark matter, what do we need to have here?
  • · Replies 11 ·
Replies
11
Views
1K
Graduate Is there a size or duration limit on fields having mass?
  • · Replies 14 ·
Replies
14
Views
2K
Graduate The case for [or against] dark matter
  • · Replies 32 ·
2
Replies
32
Views
6K