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.
Graduate Could Reformulating Gravity Solve the Dark Energy Mystery?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate What Is the Connection Between Black Hole Temperature and Event Horizons?
  • · Replies 1 ·
Replies
1
Views
2K
High School Uncovering the Truth: The Demotion of Pluto and the Search for New Dwarf Planets
  • · Replies 11 ·
Replies
11
Views
3K
Undergrad Speed of Moon without Sun gravity.
  • · Replies 30 ·
2
Replies
30
Views
4K
Graduate Space Elevator Questions and What Ifs
  • · Replies 11 ·
Replies
11
Views
4K
Undergrad Asteroid Hits Moon / Breaks it up:
  • · Replies 1 ·
Replies
1
Views
6K
High School Is it possible that (re: earth and moon)
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Newbie Asks: What Existed Before Big Bang?
  • · Replies 19 ·
Replies
19
Views
5K
High School Why Is Earth's Orbit Elliptical and Not Circular
  • · Replies 7 ·
Replies
7
Views
6K
High School View Milky Way: How to Capture Photos from Earth
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Book Research, Astronomical Justification for Plot Device
  • · Replies 6 ·
Replies
6
Views
4K
Stargazing *Quick* - Need to pick between 2 telescopes - Whats better?
  • · Replies 9 ·
Replies
9
Views
3K
High School Question about monitoring radio waves/frequencies in space.
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Entropy of Schwarzschild black holes
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad How can you tell that a planet in another star system is tidally locked?
  • · Replies 7 ·
Replies
7
Views
6K
Graduate Manned missions or colonization of the gas giants.
  • · Replies 5 ·
Replies
5
Views
4K
Graduate Is it mathematically feasible that the moon is hollow?
  • · Replies 10 ·
Replies
10
Views
15K
Undergrad Conversion of units (tangential velocity)
  • · Replies 2 ·
Replies
2
Views
5K
Graduate What is the nature of the gravitational field and its relationship to matter?
  • · Replies 10 ·
Replies
10
Views
3K
Graduate Starring Gravity, Co-Starring Magnetism
  • · Replies 7 ·
Replies
7
Views
4K
Undergrad Physics Topics for Astrophysics?
  • · Replies 2 ·
Replies
2
Views
4K
Undergrad How Does the Moon's Tidal Locking Affect Earth's Rotation?
  • · Replies 8 ·
Replies
8
Views
3K
High School How Do You Determine Position and Speed in Space?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate How to Calculate Angles on a Sphere After Multiple Rotations?
  • · Replies 2 ·
Replies
2
Views
3K
Is it possible for two planets to merge and still sustain life?
  • · Replies 9 ·
Replies
9
Views
4K
Graduate How does this affect our ability to see the early universe?
  • · Replies 20 ·
Replies
20
Views
6K
High School Simple Astronomy questions - Need
  • · Replies 8 ·
Replies
8
Views
5K
Graduate Could Cosmic Inflation Be Linked to the Expansion of Quantised Space?
  • · Replies 5 ·
Replies
5
Views
3K
Stargazing Best Telescope Under $400: Top Picks and Recommendations for US Shoppers
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad What Was the Resolving Power of Green Bank's 300-ft Telescope?
  • · Replies 2 ·
Replies
2
Views
4K
Undergrad Taking picture of stars from weather balloon
  • · Replies 2 ·
Replies
2
Views
6K
Graduate Is this Solar System Stable for Long-Term Evolution of Intelligent Life?
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Cosmic Radiation - how is our sun's speed calculated?
  • · Replies 2 ·
Replies
2
Views
2K
High School Estimating Month Length - Tips from Owen
  • · Replies 5 ·
Replies
5
Views
2K
High School Movement in Space: Understanding Acceleration & Force
  • · Replies 1 ·
Replies
1
Views
2K
High School Layman's question about orbital planes
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Can black holes allow us to break the speed of light?
  • · Replies 5 ·
Replies
5
Views
3K
High School Understanding Sun Storms: Causes, Intensities, and Time Periods
  • · Replies 4 ·
Replies
4
Views
3K
Do Parallel Universes Really Exist?
  • · Replies 28 ·
Replies
28
Views
10K
Undergrad Water in moon ejecta plume (Lcross report 22 Oct.)
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Black hole gravational pull vs neutron star ?
  • · Replies 2 ·
Replies
2
Views
5K
Undergrad Can I Pursue an Astrophysics Masters/PhD in the USA with a Mathematics Degree?
  • · Replies 4 ·
Replies
4
Views
4K
Graduate Period-Luminosity Relationship of Type I Cepheids - Need Better Formula
  • · Replies 2 ·
Replies
2
Views
5K
Graduate Must a Hot Jupiter be relatively young?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Is dark energy actually zero-point energy?
  • · Replies 4 ·
Replies
4
Views
5K
Graduate Testing Relativity: Spinning in Space - Feasible?
  • · Replies 6 ·
Replies
6
Views
3K
High School Does the earth translate around the sun?
  • · Replies 7 ·
Replies
7
Views
5K
Graduate Why Do Disk Galaxies Appear to Spin Despite Irregular Redshift Patterns?
  • · Replies 8 ·
Replies
8
Views
3K
Undergrad What Are the Competing Theories in Astrophysics: Dark Matter vs MOND?
  • · Replies 1 ·
Replies
1
Views
2K
Stargazing Increasing the resolving power of a telescope
  • · Replies 1 ·
Replies
1
Views
7K
High School Could Gliese 581 Be Our Next Habitable Planet?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad How is measuring Redshift possible?
  • · Replies 8 ·
Replies
8
Views
5K
High School Ideas for High School Astrophysics Course Syllabus
  • · Replies 8 ·
Replies
8
Views
11K
Undergrad New to astrophysics, don't have a good physics foundation, need some help
  • · Replies 7 ·
Replies
7
Views
5K
Graduate What are the limits of interstellar travel?
  • · Replies 44 ·
2
Replies
44
Views
13K
Undergrad *Quick moon question - (about orbit)
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad Formation of Stars: How Gas Spins to Fuel Birth
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Is this angular size calculation correct?
  • · Replies 1 ·
Replies
1
Views
3K
Undergrad Universe Origin: How Could Galaxy be 13B Light Years Away?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate How Does Gravity Work and What Causes Time to Slow Down Near a Black Hole?
  • · Replies 10 ·
Replies
10
Views
3K
Stargazing Pictures I took at a 2.5m telescope in the Canary Islands
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Calculating the Earth-Sun distance during perihelion
  • · Replies 9 ·
Replies
9
Views
12K
Graduate The Collision of Elliptical Galaxies: A Surprising and Promising Event
  • · Replies 2 ·
Replies
2
Views
3K
Stargazing What is the Best Catadioptric Telescope for Portability and Versatility?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Greenwich Mean Timt, GMT and Universal Coodinated Time, UT
  • · Replies 2 ·
Replies
2
Views
2K
Question about having a Theory in astronomy. ?
  • · Replies 16 ·
Replies
16
Views
4K
Undergrad Question about Objects in Ultra Deep Field
  • · Replies 3 ·
Replies
3
Views
3K
Stargazing Heyy, i've had a telescope before and know how to use them.Has
  • · Replies 3 ·
Replies
3
Views
2K
High School Is Earth’s orbit far from circular?
  • · Replies 1 ·
Replies
1
Views
2K
Stargazing What Are the Best Telescope Models Within the £100-£250 Range?
  • · Replies 1 ·
Replies
1
Views
874
Graduate Faster than Light Travel Side Effects
  • · Replies 17 ·
Replies
17
Views
9K
Undergrad Black holes giving birth to stars?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate How Do Stars Achieve Their Massive Sizes?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate What are the Current Main Research Topics in Astrophysics?
  • · Replies 1 ·
Replies
1
Views
4K
High School Question about Phases of the Moon. Thanks
  • · Replies 13 ·
Replies
13
Views
4K
High School Is the Waning Crescent Visible Near the Horizon?
  • · Replies 4 ·
Replies
4
Views
3K
High School What would happen if you fell into a black hole?
  • · Replies 5 ·
Replies
5
Views
6K
Undergrad Tides & Moon Distance: Seeking Answers
  • · Replies 11 ·
Replies
11
Views
13K
Stargazing Aug 21st, 2017, a total solar eclipse will cross the US
  • · Replies 29 ·
Replies
29
Views
5K
Graduate What Causes Hypervelocity Stars to Eject from Black Holes?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Calculating Motion in a Three-Body Gravity System: Challenges and Solutions
  • · Replies 12 ·
Replies
12
Views
8K
Undergrad Calculating Gravities for Math to the Moon
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Astrometry and Elliptical orbits
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Can We Reach the Moon with a Slow, Steady Launch?
  • · Replies 9 ·
Replies
9
Views
4K
Undergrad How Can We Determine the Size of a Black Hole?
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Could Heat Exchange Be the Reason Behind Earth's Spin?
  • · Replies 3 ·
Replies
3
Views
4K
Undergrad Strange wikipedia entry about the sun's core
  • · Replies 3 ·
Replies
3
Views
3K
Graduate The infinite possobilities presented by the infinite amount of probabilities
  • · Replies 14 ·
Replies
14
Views
4K
High School Why are solar eclipses so short compared to lunar eclipses?
  • · Replies 3 ·
Replies
3
Views
7K
Graduate Negative pressure and dark energy
  • · Replies 10 ·
Replies
10
Views
5K
Graduate Why smaller particles come together
  • · Replies 6 ·
Replies
6
Views
5K
Graduate Colliding Black Holes: Will the Smaller Get Pulled In?
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Define/explain this gravity calculation (picture)
  • · Replies 4 ·
Replies
4
Views
4K
John Huchra Dies at 61; Maps Altered Ideas on Universe
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Can a QM/GR overlap provide a breakthrough in understanding gravity?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate What is the energy of the galactic magnetic field? (E/c^2)
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Plotting Intensity in Airy Pattern of Telescope - 1D
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Subatomic particle and space curvature
  • · Replies 10 ·
Replies
10
Views
4K
High School Super black holes and stars orbiting them
  • · Replies 16 ·
Replies
16
Views
5K
Graduate Super-black holes and the universe
  • · Replies 11 ·
Replies
11
Views
5K