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 Calculating Circumpolar Star Declination for Different Latitudes
  • · Replies 3 ·
Replies
3
Views
7K
High School Beginners Questions about Astronomy
  • · Replies 6 ·
Replies
6
Views
4K
Graduate G from cosmological measurements
  • · Replies 1 ·
Replies
1
Views
3K
High School Can Carbon Nanotubes Make Space Elevators a Reality?
  • · Replies 33 ·
2
Replies
33
Views
7K
Graduate An way to visualize dark matters effects on space-time?
  • · Replies 4 ·
Replies
4
Views
4K
Graduate Thought Experiment on Dark Matter
  • · Replies 2 ·
Replies
2
Views
3K
High School Get Astronomy Homework Help for Confusing Problems - Due Tomorrow Morning!
  • · Replies 1 ·
Replies
1
Views
2K
Graduate What is the elusive origin of gravity?
  • · Replies 70 ·
3
Replies
70
Views
17K
High School Agol, Interesting objects in Perseus.
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Does Increasing Density Increase Gravity?
  • · Replies 27 ·
Replies
27
Views
6K
Undergrad What Are the Latest Discoveries in the Search for Earth-like Exoplanets?
  • · Replies 2 ·
Replies
2
Views
4K
Graduate What Is the Universe's Topology According to Recent Research?
  • · Replies 25 ·
Replies
25
Views
6K
High School Which Books Are Best for Beginners in Cosmology?
  • · Replies 5 ·
Replies
5
Views
23K
Graduate Question about the Horizon Problem
  • · Replies 9 ·
Replies
9
Views
5K
Graduate Data on galaxies -good references ?
  • · Replies 1 ·
Replies
1
Views
3K
Undergrad Types of Supernovae: How to Distinguish Them
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Singularity/Expanding Universe questions
  • · Replies 25 ·
Replies
25
Views
10K
High School Space Temperature: Is There a Temperature in Space?
  • · Replies 3 ·
Replies
3
Views
5K
Graduate Is Faster-Than-Light Travel the Key to Interplanetary Exploration?
  • · Replies 13 ·
Replies
13
Views
3K
Stargazing Looking for advice on telescope
  • · Replies 8 ·
Replies
8
Views
4K
Undergrad Solar Wind Flux: Electron/Proton Count Reaching Earth
  • · Replies 2 ·
Replies
2
Views
5K
Undergrad Weight dependent on planet size and rotation speed?
  • · Replies 1 ·
Replies
1
Views
6K
Undergrad Starting in Cosmology: Understanding the Role of Physics and GR
  • · Replies 7 ·
Replies
7
Views
7K
Stargazing Is there a DSLR with programmable frame rate for sequential shots?
  • · Replies 3 ·
Replies
3
Views
1K
Graduate Miniprobes for interstellar exploration
  • · Replies 8 ·
Replies
8
Views
3K
High School Why Does the Aurora Only Occur in the North Pole?
  • · Replies 2 ·
Replies
2
Views
5K
High School Is the Milky Way Really a Spiral Galaxy?
  • · Replies 2 ·
Replies
2
Views
3K
High School Can Dark Matter and Dark Energy Be Used to Explain Superhero Powers?
  • · Replies 4 ·
Replies
4
Views
3K
Is the Rocket Equation Holding Back Space Shuttle Safety?
  • · Replies 26 ·
Replies
26
Views
5K
Undergrad Fusion in the Sun: Neutrons or Neutrinos – What is Produced?
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad Does the Sun's fusion reaction produce neutrons or neutrinos?
  • · Replies 4 ·
Replies
4
Views
10K
Graduate Can Andromeda Detect Earth's Past with a Giant Telescope?
  • · Replies 20 ·
Replies
20
Views
6K
Graduate Highest Energy Cosmic Rays Linked to Violent Black Holes
  • · Replies 8 ·
Replies
8
Views
3K
Graduate What Happens When a Black Hole Evaporates Below its Schwarzschild Radius?
  • · Replies 32 ·
2
Replies
32
Views
8K
Graduate Why Do Scientists Believe in the Existence of Wormholes?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Confused about Metallicity Measurement in Milky Way
  • · Replies 2 ·
Replies
2
Views
4K
Graduate Discussing Arp's Cosmology: Issues & Evidence
  • · Replies 4 ·
Replies
4
Views
4K
High School Matter & Space: Interaction & Occupancy
  • · Replies 4 ·
Replies
4
Views
3K
High School Is the Universe Actually Spiky Instead of Smooth?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Solving the Dispute: Criticism of Hartle-Hawking Model Explained
  • · Replies 5 ·
Replies
5
Views
7K
The Mystery of the Origin of the Universe: Perspectives and Theories Explored
  • · Replies 13 ·
Replies
13
Views
6K
Stargazing Neutrino Telescopes may have nothing to see
  • · Replies 9 ·
Replies
9
Views
4K
What is the Naked Eye Comet in Perseus?
  • · Replies 11 ·
Replies
11
Views
4K
Graduate What is the Estimated Local Star Formation Rate and How Accurate is it?
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Upper limit on the rest mass of neutrinos if. .
  • · Replies 1 ·
Replies
1
Views
5K
Undergrad Question about the obliquity of the ecliptic
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Questioning the big bang theory.
  • · Replies 8 ·
Replies
8
Views
5K
Graduate Is the Universe Actually a Cosmic Computer?
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad What Happens in Black and White Holes?
  • · Replies 26 ·
Replies
26
Views
26K
Graduate Photon Energy vs. Red Shift, Inflation Theory, Acceleration
  • · Replies 18 ·
Replies
18
Views
8K
Graduate Meaning of cosmological constant ?
  • · Replies 4 ·
Replies
4
Views
4K
Graduate Cause of Quasar Wind: The Mystery
  • · Replies 7 ·
Replies
7
Views
4K
Graduate Does the Big Bang Theory Break Down at the Planck Time?
  • · Replies 12 ·
Replies
12
Views
5K
High School Does a Black hole emit anything?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Hubble's Redshift: Conclusions and Vacuum Solutions
  • · Replies 3 ·
Replies
3
Views
4K
Undergrad How Much difference b2in theoritical and experimental astrophysics?
  • · Replies 1 ·
Replies
1
Views
4K
High School Why do planets revolve in elliptical orbits?
  • · Replies 2 ·
Replies
2
Views
7K
Undergrad Albedo and reflected light from the moon
  • · Replies 8 ·
Replies
8
Views
9K
Graduate How Can We See the Universe's Past if We Are Made from It?
  • · Replies 10 ·
Replies
10
Views
3K
Graduate Does the Confusing Supernova Challenge the Big Bang Theory?
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Is the Big Bang Theory a Foolhardy Extrapolation?
  • · Replies 58 ·
2
Replies
58
Views
11K
Graduate Big Bang and the Second Law of Thermodynamics
  • · Replies 3 ·
Replies
3
Views
6K
High School What Pulls the Sun? Understanding Gravitational Pull and Mass Effect
  • · Replies 7 ·
Replies
7
Views
4K
Graduate Can Future Civilizations Harness Entropy to Survive in an Expanding Universe?
  • · Replies 3 ·
Replies
3
Views
4K
Graduate What is the ultimate fate of the universe?
  • · Replies 2 ·
Replies
2
Views
4K
High School Does a planets orbit ever go chaotic?
  • · Replies 5 ·
Replies
5
Views
4K
Stargazing Non-Magnifying Telescope Lenses: Components & Effects
  • · Replies 8 ·
Replies
8
Views
4K
Graduate Friedmann Cosmology at T < 1 second
  • · Replies 10 ·
Replies
10
Views
4K
Is Earth at Risk from Rogue Black Holes?
  • · Replies 5 ·
Replies
5
Views
4K
High School What Does Expanding Universe Mean?
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad Universe expansion -> t = - inifinite
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Question on gravitational lensing
  • · Replies 8 ·
Replies
8
Views
3K
Graduate Another hawking radiation question
  • · Replies 1 ·
Replies
1
Views
3K
High School Gravity & Big Bang: Can Matter Escape Its Own Pull?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Can a Photon's Energy Approach Zero?
  • · Replies 4 ·
Replies
4
Views
6K
Undergrad A Parallel Planet: Discovering Unseen Worlds
  • · Replies 20 ·
Replies
20
Views
11K
Graduate Friiedman Fun Facts to know and tell
  • · Replies 54 ·
2
Replies
54
Views
11K
High School Planets and Stars: Will Our Sun Orbit Bodies With Greater Gravity?
  • · Replies 10 ·
Replies
10
Views
5K
Graduate What are the unexpected aspects of cosmology?
  • · Replies 2 ·
Replies
2
Views
3K
High School Asteroid Database: Find Objects with RA, Dec & Julian Date
  • · Replies 5 ·
Replies
5
Views
6K
Graduate Are Wormholes at the End of Black Holes a Possible Theory?
  • · Replies 3 ·
Replies
3
Views
5K
Graduate Can Energy Compression Create a Black Hole?
  • · Replies 6 ·
Replies
6
Views
3K
High School Edwin Hubble's Redshift and the Hubble Space Telescope
  • · Replies 11 ·
Replies
11
Views
6K
Is the Space Station Being Decommissioned?
  • · Replies 13 ·
Replies
13
Views
5K
Graduate Big Bang and Big Rip Theory: Is Expansion the End?
  • · Replies 6 ·
Replies
6
Views
4K
Graduate Is There an Infinite Number of Universes in Infinity Itself?
  • · Replies 11 ·
Replies
11
Views
9K
Graduate Objects Entering Black Holes: The "Spaghetti" Effect
  • · Replies 2 ·
Replies
2
Views
3K
Stargazing Gaze the Stars: Tips for High Schooler Stargazing in OC
  • · Replies 8 ·
Replies
8
Views
1K
High School Electron, Atom, Planet, Star: Do All Galaxies Orbit a Single Mass?
  • · Replies 3 ·
Replies
3
Views
3K
What is the estimated age of the Kebira crater in Libya?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate UV Star Redshift 8: Doppler Effect Impact on IR Spectrum?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Distance to See One Star: Current Tech & Laws
  • · Replies 11 ·
Replies
11
Views
4K
Undergrad Gravitational lensing and Dark matter
  • · Replies 5 ·
Replies
5
Views
4K
Undergrad How Far Can We See the Brightest Known Star?
  • · Replies 2 ·
Replies
2
Views
5K
High School Global warming and solar actvities
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad The Mystery of Earth's Rotation & Revolution
  • · Replies 34 ·
2
Replies
34
Views
7K
Undergrad Mercury: Why Doesn't it Vaporize Away?
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad So , we don't know how universe began?
  • · Replies 45 ·
2
Replies
45
Views
10K
High School How Will the Universe Ultimately Meet Its End?
  • · Replies 10 ·
Replies
10
Views
4K
High School Matter combined with Antimater question
  • · Replies 9 ·
Replies
9
Views
6K