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.
Graduate Is dark energy really responsible for the expansion of the universe?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Entropy & Cosmology: Arrow of Time Paradox
  • · Replies 11 ·
Replies
11
Views
4K
Graduate What Is an Unambiguous Standard for Pulsar Periods?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Is Spacetime a Tangible Entity or Just a Relational Concept in Physics?
  • · Replies 72 ·
3
Replies
72
Views
9K
Graduate How does the light from distant galaxies support the theory of the Big Bang?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Does a finite universe make sense to you?
  • · Replies 151 ·
6
Replies
151
Views
23K
High School Why is a space probe spinning around its own axes, when flying through space?
  • · Replies 6 ·
Replies
6
Views
4K
Graduate Untangling the Implications of CMB for the Cosmological Model
  • · Replies 19 ·
Replies
19
Views
5K
Graduate Could it be possible that gravity is the reason why the universe is expanding?
  • · Replies 6 ·
Replies
6
Views
3K
Stargazing Building a telescope ( from another one )
  • · Replies 2 ·
Replies
2
Views
3K
Is black hole a racially insensitive term?
  • · Replies 79 ·
3
Replies
79
Views
12K
High School Energy carried by the bulk motion of matter
  • · Replies 2 ·
Replies
2
Views
8K
Undergrad Earth-Moon Barycentre: Movement & Effects
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Expanding universe expanding atoms
  • · Replies 19 ·
Replies
19
Views
15K
Undergrad At what altitude and velocity is an orbit geosynchronous?
  • · Replies 11 ·
Replies
11
Views
8K
Graduate Does the Planck length grow with the scale factor?
  • · Replies 5 ·
Replies
5
Views
4K
Graduate Terminology: Omega_0 = Omega_m? and more
  • · Replies 1 ·
Replies
1
Views
3K
Undergrad Why Do Objects in Space Spiral Around Larger Masses?
  • · Replies 11 ·
Replies
11
Views
3K
High School Why Does Thrust Differ for Objects of Different Mass in Space?
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Unanswered phenomenon in earth orbit
  • · Replies 12 ·
Replies
12
Views
3K
Undergrad Universe Expansion: Understanding the Speed of Light and Galaxies Far Away
  • · Replies 13 ·
Replies
13
Views
5K
Graduate How to measure the tangential component of velocity of receding starsor quasars?
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Red - blue shifts and stellar rotation
  • · Replies 8 ·
Replies
8
Views
4K
Graduate Topology Q: Curved Space w/out Higher Dimensions?
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Beginning of space, time, matter, energy
  • · Replies 5 ·
Replies
5
Views
9K
Graduate Is the universe a recycling bin? (Entropy)
  • · Replies 22 ·
Replies
22
Views
11K
Undergrad Is IK Pegasi (HR 8210) dangerous to us at all?
  • · Replies 4 ·
Replies
4
Views
11K
Graduate Is the Universe's Expansion Slowing Down or Speeding Up?
  • · Replies 6 ·
Replies
6
Views
3K
High School The Mysteries of the Universe: A Parent's Guide
  • · Replies 4 ·
Replies
4
Views
4K
Undergrad A Look at the Naming of Exoplanets
  • · Replies 2 ·
Replies
2
Views
6K
Graduate Determining the Argument of the Perihelion of the Earth: Which Value is Correct?
  • · Replies 2 ·
Replies
2
Views
8K
Undergrad Are they moving faster than light?
  • · Replies 3 ·
Replies
3
Views
5K
Undergrad A Layman's Question of the Big Bang
  • · Replies 9 ·
Replies
9
Views
4K
Graduate The Time Evolution of an Infinite 3D Grid of Mass Particles
  • · Replies 28 ·
Replies
28
Views
9K
Graduate Could the Big Bang Theory Be Incorrect?
  • · Replies 7 ·
Replies
7
Views
5K
Graduate The Origin of the Universe: Unraveling the Mystery of the Big Bang
  • · Replies 25 ·
Replies
25
Views
10K
Graduate Deriving the Chandrasekhar Limit on a Napkin
  • · Replies 9 ·
Replies
9
Views
9K
Graduate Beyond Big Bang gets a bit more visible
  • · Replies 17 ·
Replies
17
Views
6K
High School Is the Moon Really Bigger on the Horizon? A Closer Look at the Optical Illusion
  • · Replies 4 ·
Replies
4
Views
7K
Graduate Astronomical influence on climate
  • · Replies 6 ·
Replies
6
Views
5K
Undergrad Please tell me if im imagining this correctly.
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Absorb all sort of matter and radiations and still not releasing out?
  • · Replies 13 ·
Replies
13
Views
5K
Water Found on Mars: Now to Melt It
  • · Replies 54 ·
2
Replies
54
Views
10K
Graduate Unit of Measurement: Arbitrary or Dependent on Physical Laws?
  • · Replies 36 ·
2
Replies
36
Views
6K
Graduate Does the Capernican Principle Apply to Pre-Big Bang Models?
  • · Replies 20 ·
Replies
20
Views
5K
Graduate Does the universe have infinite mass?
  • · Replies 17 ·
Replies
17
Views
12K
Graduate What will happen when the CMB will raise the zero?
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Keplers Equation: Finding Eccentric Anomaly E
  • · Replies 19 ·
Replies
19
Views
9K
Is it possible to get someone's Myspace email?
  • · Replies 1 ·
Replies
1
Views
17K
Graduate Atmospheric Gamma Ray Interactions
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Do Cosmological Tidal Forces Prove the Expansion of Space?
  • · Replies 9 ·
Replies
9
Views
3K
Undergrad Giant Asteroid Flattened Half of Mars, Studies Suggest
  • · Replies 2 ·
Replies
2
Views
3K
High School Latest Martian Ice News: Scientists Investigate Water Ice on Red Planet
  • · Replies 26 ·
Replies
26
Views
5K
Graduate Supernovae of Procyon & Capella Systems
  • · Replies 3 ·
Replies
3
Views
4K
Undergrad Perihelion Pass Dates for Planets - Alex's JS Orrery
  • · Replies 5 ·
Replies
5
Views
5K
Graduate Dark Energy & ZPE: How Can Wave Fragment Have Frequency?
  • · Replies 1 ·
Replies
1
Views
2K
What are your thoughts about the Large Hadron Collider?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Cosmic Microwave Background and Its Temperature
  • · Replies 18 ·
Replies
18
Views
7K
Graduate Understanding Hubble's Law: Calculating Recession Velocity and Hubble's Constant
  • · Replies 3 ·
Replies
3
Views
3K
Mars - this is how it went down. (just for fun/argument sake)
  • · Replies 11 ·
Replies
11
Views
3K
Graduate Kustaanheimo-Stiefel transformation ?
  • · Replies 2 ·
Replies
2
Views
5K
Graduate Proof That the Universe is Electrically Neutral
  • · Replies 41 ·
2
Replies
41
Views
32K
Graduate Twins stars born at different time
  • · Replies 1 ·
Replies
1
Views
2K
Mars Soil Has Nutrients Capable of Supporting Life
  • · Replies 19 ·
Replies
19
Views
5K
High School Are All Planets Rotating in the Same Direction, Except Venus and Uranus?
  • · Replies 1 ·
Replies
1
Views
4K
High School Read in a book that fall in a bh is the sameto go at c
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Surface brightness profiles: sech^2 fit in mag/arcsec^2 units?
  • · Replies 1 ·
Replies
1
Views
5K
Graduate Is the Multiverse a Revolving Landscape of Universes?
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Does the accelerated Expansion add credibility to Steady State Cosmology?
  • · Replies 17 ·
Replies
17
Views
5K
Temperature of the surface of a satellite?
  • · Replies 7 ·
Replies
7
Views
4K
Commercial Spaceflight: When Will it be Accessible?
  • · Replies 9 ·
Replies
9
Views
3K
  • Poll Poll
Can mankind transcend the fabric of space and time?
  • · Replies 69 ·
3
Replies
69
Views
13K
Graduate How Does the Sudbury Neutrino Observatory Confirm Neutrino Interactions?
  • · Replies 5 ·
Replies
5
Views
4K
Sky Cut Meaning: Definition & Explanation
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Type1a supernovae as evidence for an accelerating universe
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Reconstruction Primordial Fluctuations from Temperature Anisotropy
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Does the coordinates of time cause the uncertainty in the universe?
  • · Replies 1 ·
Replies
1
Views
2K
Is this Hanny's Voorwerp or Kermit the Frog in space?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Big Bang Singularity: What Prevents Universe from Becoming Black Hole?
  • · Replies 32 ·
2
Replies
32
Views
9K
Graduate Basic physics in remote universe (proton/electron mass ratio)
  • · Replies 1 ·
Replies
1
Views
4K
High School Pluto belongs to a new category : plutoids
  • · Replies 7 ·
Replies
7
Views
4K
Undergrad Can Newton's Law Be Expressed as F=G\rho\rho1\frac{}{} d^{}2?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Phoenix craft to dig under Mars ice (landing planned 25 May)
  • · Replies 53 ·
2
Replies
53
Views
11K
Undergrad How Come Planets Don't Fall Into Stars?
  • · Replies 24 ·
Replies
24
Views
16K
Undergrad Gravity Pull: Calculating Time to Impact
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Comments on the tethered galaxy propblem.
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Kinematic GR models of expansion
  • · Replies 24 ·
Replies
24
Views
6K
Graduate Gravity's effects on primordial plasma
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad What Are the Best Forums for Discussing Non-Mainstream Cosmology Theories?
  • · Replies 46 ·
2
Replies
46
Views
13K
High School Could ever Pluto slam into Neptune?
  • · Replies 3 ·
Replies
3
Views
6K
Undergrad Black holes created the big bang?
  • · Replies 27 ·
Replies
27
Views
9K
Graduate Big Bang v. Cyclic Universe models
  • · Replies 18 ·
Replies
18
Views
9K
Graduate Blackholes, Jets and Dark Matter.
  • · Replies 3 ·
Replies
3
Views
3K
Drawing moon phases - what’s your opinion?
  • · Replies 8 ·
Replies
8
Views
8K
Undergrad Calculating Semimajor Axis of Meteor Orbit
  • · Replies 1 ·
Replies
1
Views
3K
Is the Tracking Error of the Telescopic Scope Mount a Dealbreaker?
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Gravity and curvature in spacetime
  • · Replies 5 ·
Replies
5
Views
4K
Graduate Is the Hubble constant, constant?
  • · Replies 19 ·
Replies
19
Views
15K
Graduate Einstein@Home search for periodic gravitational waves in LIGO S4 data
  • · Replies 20 ·
Replies
20
Views
6K
Undergrad Light Bending and Mass: Understanding the Effects of Gravity on Light
  • · Replies 9 ·
Replies
9
Views
4K