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 Understanding LIGO and Its Implications
  • · Replies 1 ·
Replies
1
Views
2K
Graduate What happens to the shape of particles when exposed to massive gravity?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Cosmic microwave background radiation
  • · Replies 1 ·
Replies
1
Views
3K
Graduate 1000 TeV neutrinos - dark matter decay proposed as explanation
  • · Replies 20 ·
Replies
20
Views
6K
Graduate Could dark matter be negative pressure
  • · Replies 5 ·
Replies
5
Views
3K
Graduate What is wrong with eternal inflation model?
  • · Replies 9 ·
Replies
9
Views
6K
Graduate Difference between Big Chill and Big Snap scenarious
  • · Replies 4 ·
Replies
4
Views
4K
Graduate How To Determine The Exact Speed You Are Moving In The Universe
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Multiverse Evidence Explanation?
  • · Replies 120 ·
5
Replies
120
Views
32K
Graduate What is Space outside of the universe and infinity according to Physics?
  • · Replies 56 ·
2
Replies
56
Views
25K
High School What is the sun's corona and how can it be captured in a photograph?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Why Use Wave Modes to Describe Density Fluctuations?
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Why galaxies are further from us
  • · Replies 14 ·
Replies
14
Views
3K
Graduate Apparent magnitude of the Moon from Mercury?
  • · Replies 3 ·
Replies
3
Views
4K
High School What Makes the Cat's Eye Nebula's Core Appear So Energetic?
  • · Replies 4 ·
Replies
4
Views
6K
Graduate Theoretical physicist says universe has radius=10cm
  • · Replies 11 ·
Replies
11
Views
6K
Graduate Why Does the Cosmological Constant Have Different Units?
  • · Replies 9 ·
Replies
9
Views
6K
High School Can we tell when a Star has died the moment it happens?
  • · Replies 5 ·
Replies
5
Views
4K
Undergrad How Do You Calculate the Sunset Time on the Winter Solstice at 40 Degrees North?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Do our inertial frames rotate with the Milky Way?
  • · Replies 6 ·
Replies
6
Views
4K
Undergrad The age old age of the universe question
  • · Replies 11 ·
Replies
11
Views
5K
Graduate Could there be a connection between the cosmological background
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Inflationary cosmology questions
  • · Replies 10 ·
Replies
10
Views
4K
Graduate Why the fundamental laws of nature is the way it is?
  • · Replies 5 ·
Replies
5
Views
4K
High School Why Do Stars Appear to Move in a Four-Year Cycle?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Cosmological Principle: Trying to define large-scale homogeneity
  • · Replies 13 ·
Replies
13
Views
6K
Graduate New space that accounts for dark energy?
  • · Replies 20 ·
Replies
20
Views
5K
Undergrad We cannot measure the speed of light
  • · Replies 8 ·
Replies
8
Views
3K
Graduate Looking for a decent gravity simulator
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Are We Living Inside a Black Hole?
  • · Replies 10 ·
Replies
10
Views
4K
Graduate Could the Universe Be Shrinking Instead of Expanding?
  • · Replies 7 ·
Replies
7
Views
4K
Graduate Questions and comments about cosmo FAQ
  • · Replies 0 ·
Replies
0
Views
2K
High School Growth of Universe: Branching vs Other Reasons
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Could meteorites contain evidence of troilite drainage and trapped iron grains?
  • · Replies 6 ·
Replies
6
Views
4K
Graduate Could an Anti-Universe Exist?
  • · Replies 26 ·
Replies
26
Views
10K
Graduate Why can we see space, but not time?
  • · Replies 43 ·
2
Replies
43
Views
7K
Undergrad Is there any relation between orbital motion and spin motion?
  • · Replies 4 ·
Replies
4
Views
15K
Undergrad Distance to the Sun using Venus transit
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Color temperature and effective temperature of a star
  • · Replies 1 ·
Replies
1
Views
7K
Graduate Does ACE IMF Polarity Come from Bz Data?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Improving Meteor Image Quality: Methods for Noise Reduction and Detection
  • · Replies 7 ·
Replies
7
Views
4K
Graduate An infinite universe is necessarily in expansion
  • · Replies 16 ·
Replies
16
Views
4K
Graduate Can we trust our measurements in cosmology?
  • · Replies 11 ·
Replies
11
Views
3K
Undergrad Does ''expanding space'' mean formation of new space?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Is Universal Time the Key to Understanding Existence?
  • · Replies 18 ·
Replies
18
Views
4K
Graduate How are inflaton particles that drive the early inflation created?
  • · Replies 8 ·
Replies
8
Views
18K
Graduate Shouldn't objects entering black holes be instantly shredded?
  • · Replies 42 ·
2
Replies
42
Views
27K
Undergrad Research topics in Variable stars
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Nutronstars - how they can put out light?
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Have we ever sent anything into the atmosphere of the gas giants?
  • · Replies 5 ·
Replies
5
Views
4K
Undergrad What Is the Orbital Length in Km on This Graph?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Is there evidence of space surrounding the BB singularity?
  • · Replies 13 ·
Replies
13
Views
4K
Graduate Chances of hitting something in intergalactic travel
  • · Replies 3 ·
Replies
3
Views
5K
Undergrad More garbage science reporting about the sun
  • · Replies 9 ·
Replies
9
Views
5K
High School Universe will end in 5 billion years?
  • · Replies 3 ·
Replies
3
Views
3K
Spot a Nova in Delphinus - Bright Mag 6
  • · Replies 5 ·
Replies
5
Views
3K
High School Phases of the Moon: Amateur Questions Answered
  • · Replies 6 ·
Replies
6
Views
4K
Graduate Experimental status of stellar structure
  • · Replies 4 ·
Replies
4
Views
2K
Graduate What is the size of a singularity in a black hole?
  • · Replies 46 ·
2
Replies
46
Views
31K
Undergrad Will the Earth survive the Sun becoming a red giant?
  • · Replies 10 ·
Replies
10
Views
5K
Graduate Are Quantum Mechanics and Cosmology Directly Linked?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate What Are the Different Types of Symmetries in Grand Unified Theory?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Luminosity Distance: Explaining the Length Differences
  • · Replies 14 ·
Replies
14
Views
5K
Graduate What were the initial ingredients of the BB
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Access Solar Radiation Data: UV-A, UV-B & UV-C
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Consequences of parallel universes
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Are There Other Universes with Different Laws of Physics and Math?
  • · Replies 25 ·
Replies
25
Views
6K
Graduate Are branes valid science or just fancy math?
  • · Replies 5 ·
Replies
5
Views
3K
High School Is there a temperature in the universe beyond Earth's atmosphere?
  • · Replies 10 ·
Replies
10
Views
4K
Graduate Could Dark Matter and Dark Energy Just Be a Result of Particles in Space?
  • · Replies 10 ·
Replies
10
Views
5K
Stargazing Saving the telescope with damaged optics
  • · Replies 18 ·
Replies
18
Views
5K
Graduate Using positive pressure in cosmological equations
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Solving Kepler Problem for 2-Body System: Velocity & Position
  • · Replies 5 ·
Replies
5
Views
2K
High School Can I Use Microwaves to Study Asteroids?
  • · Replies 7 ·
Replies
7
Views
3K
High School What is dark matter and dark energy, and how do we know they exist?
  • · Replies 7 ·
Replies
7
Views
4K
Graduate How Did Quarks Occur in the Early Universe?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Gravitational Collapse: Is Black Hole Formation Inevitable?
  • · Replies 14 ·
Replies
14
Views
4K
Undergrad Planet formation vs Sun collapse
  • · Replies 5 ·
Replies
5
Views
3K
High School Earth sized lava world discovered
  • · Replies 10 ·
Replies
10
Views
3K
Graduate The epansion of space, not matter
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Is the Universe's Expansion Uniform?
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Metric expansion in terms of planck pixels
  • · Replies 1 ·
Replies
1
Views
3K
High School Heat Death of the Universe: Is It Inevitable?
  • · Replies 6 ·
Replies
6
Views
4K
Undergrad What evidence supports the validity of the Big Bang theory?
  • · Replies 44 ·
2
Replies
44
Views
16K
Graduate Matter ingestion rate of blackholes
  • · Replies 3 ·
Replies
3
Views
2K
Media hype about meteor showers
  • · Replies 12 ·
Replies
12
Views
4K
What is the mysterious purple-violet oval in the night sky?
  • · Replies 10 ·
Replies
10
Views
4K
High School Why can't we whistle in a closed space?
  • · Replies 7 ·
Replies
7
Views
4K
Graduate A question relating to expansion rate of the Universe
  • · Replies 31 ·
2
Replies
31
Views
5K
Graduate Compact 3-manifolds of Negative Curvature
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Holographic principle, mathematical universe & dimensional reduction
  • · Replies 1 ·
Replies
1
Views
2K
High School An Aurora Watch alert issued today
  • · Replies 2 ·
Replies
2
Views
3K
Graduate SN 1a Progenitor Classes: Statistical Analysis
  • · Replies 2 ·
Replies
2
Views
2K
High School Why is our moon exactly half when half?
  • · Replies 38 ·
2
Replies
38
Views
6K
Graduate Speed of light (from redshifted galaxies)
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Did the Big Bang create gravity and matter?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Moon orbiting close to its host planet
  • · Replies 2 ·
Replies
2
Views
4K
High School Our sun to soon reverse its magnetic field
  • · Replies 24 ·
Replies
24
Views
6K
What is the Scale of the Universe?
  • · Replies 2 ·
Replies
2
Views
2K
High School What is the definition of cosmology in a physics context?
  • · Replies 7 ·
Replies
7
Views
3K