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.
High School The Earth as pendulum tied not to the Sun
  • · Replies 9 ·
Replies
9
Views
3K
Undergrad Size of VY Canismajoris and gravity
  • · Replies 5 ·
Replies
5
Views
4K
What is the estimated worth of a planet made entirely of diamond?
  • · Replies 21 ·
Replies
21
Views
6K
Graduate Can Extended Theories of Gravity Explain Dark Matter and Dark Energy?
  • · Replies 24 ·
Replies
24
Views
5K
Graduate Placing a cargo on a parabolic orbit from europa moon of Jupiter
  • · Replies 3 ·
Replies
3
Views
3K
High School What is this galaxy? I can't work it out
  • · Replies 17 ·
Replies
17
Views
4K
Graduate Understanding Circumstellar Disks: Exploring Surface Density in 3D
  • · Replies 6 ·
Replies
6
Views
3K
High School Is Earth Orbiting the Sun Dynamically?
  • · Replies 8 ·
Replies
8
Views
4K
High School Why Does the Sun Bob Up and Down in its Orbit?
  • · Replies 28 ·
Replies
28
Views
8K
Graduate Can Energy exist with the absence of matter?
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Conceptual Q: Gravity, Angular Momentum, and Galaxies
  • · Replies 9 ·
Replies
9
Views
3K
High School Is Constant Rest Possible in Outer Space?
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Could the Big Bang Have Been a Massive Black Hole Eruption?
  • · Replies 17 ·
Replies
17
Views
4K
Graduate Black hole growth and evaporation
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Are Statistical Mechanics Adequate for Interstellar and Intergalactic Clouds?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Kudo list of well-written exchanges for the month of April :-D
  • · Replies 0 ·
Replies
0
Views
2K
Graduate Why doesn't dark matter clump together?
  • · Replies 1 ·
Replies
1
Views
3K
High School Why Do We Search for Exoplanets?
  • · Replies 20 ·
Replies
20
Views
9K
Graduate Analyse Simulated Galaxies with SDSS Telescope | Survey by J.W. Trayford
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Are there any large star databases containing mass and density?
  • · Replies 4 ·
Replies
4
Views
4K
Graduate What is the TSS Engine and how can it enhance space-related learning?
  • · Replies 6 ·
Replies
6
Views
3K
Graduate How can we say star mass affects event horizon diameter ?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad What Is Space in Physics?
  • · Replies 30 ·
2
Replies
30
Views
5K
Undergrad The time it takes the Earth to go around the Sun.
  • · Replies 49 ·
2
Replies
49
Views
15K
Undergrad Why are Cosmic Rays and Hard X-rays Essential for Heating Molecular Clouds?
  • · Replies 2 ·
Replies
2
Views
3K
High School The Earth-Sun Relationship: A Matter of Perspective
  • · Replies 91 ·
4
Replies
91
Views
14K
Graduate HR diagram: magnitude - luminosity relation
  • · Replies 3 ·
Replies
3
Views
4K
High School How does the sun burn without oxygen?
  • · Replies 5 ·
Replies
5
Views
5K
Graduate Gravitational Acceleration Differences in a Pulsar: Calculation and Comparison
  • · Replies 4 ·
Replies
4
Views
5K
Graduate Decent papers/articles on black holes
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Trying to understand the oscillation of electrons in the magnetic fiel
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Understanding the Nature of WIMPS: Bosons or Fermions?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Problems with living outside the Heliosphere?
  • · Replies 1 ·
Replies
1
Views
3K
Undergrad Life in Universe: Is Intelligent Life Inevitable?
  • · Replies 91 ·
4
Replies
91
Views
22K
Stargazing New cosmic model parameters from South Pole Telescope
  • · Replies 35 ·
2
Replies
35
Views
8K
Undergrad Can anything truly be stationary in our constantly moving universe?
  • · Replies 3 ·
Replies
3
Views
4K
Graduate How Does a Comet's Path Relate to Relativity and Spacetime?
  • · Replies 9 ·
Replies
9
Views
3K
Undergrad What Are the Fastest Moving Objects in the Universe?
  • · Replies 11 ·
Replies
11
Views
3K
Graduate How Does Particle Size Influence Emissivity in Circumstellar Dust?
  • · Replies 4 ·
Replies
4
Views
3K
High School From where did our earth get its initial velocity ?
  • · Replies 7 ·
Replies
7
Views
11K
Undergrad Best tables for data of objects in our solar system?
  • · Replies 3 ·
Replies
3
Views
4K
Undergrad Mystery of the Pushed Away Black Hole
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Exploring the Habitable Zone: Limits and Possibilities for Detecting Alien Life
  • · Replies 26 ·
Replies
26
Views
7K
Graduate On the formation of larger bodies in space after dust attraction.
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Understanding Magnetars and Neutron Stars
  • · Replies 11 ·
Replies
11
Views
4K
Graduate Neutron Stars: Quantum or Classical Objects?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Questions about nuclear physics inside a star
  • · Replies 13 ·
Replies
13
Views
3K
Undergrad Time Space Matter Characteristics
  • · Replies 3 ·
Replies
3
Views
2K
Graduate What would happen if a black hole sucked in a cloud of hydrogen gas?
  • · Replies 15 ·
Replies
15
Views
3K
Undergrad Can Planetary Gravity Flatten an Egg-Shaped Planet?
  • · Replies 9 ·
Replies
9
Views
3K
Graduate History of speed of the expansion of the universe?
  • · Replies 4 ·
Replies
4
Views
4K
Graduate What speed do quasars eject matter out the galaxy?
  • · Replies 8 ·
Replies
8
Views
5K
Photo of Jupiter's moons with cellphone
  • · Replies 39 ·
2
Replies
39
Views
17K
Graduate Do Black Holes *actually* exist?
  • · Replies 43 ·
2
Replies
43
Views
9K
Graduate Could the LHC potentially form a black hole?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Near earth Asteroids and a space elevator
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Questions about Nuclear Fusion in the Sun
  • · Replies 9 ·
Replies
9
Views
4K
Graduate How to calculate orbitals of celestial bodies using calculus?
  • · Replies 1 ·
Replies
1
Views
2K
Compiling Common Star Names for FK5 - Help Needed!
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Can We Really Understand Black Holes If Nothing Can Escape Them?
  • · Replies 14 ·
Replies
14
Views
3K
Stargazing Telescopes 101: Intro Guide For Beginners Under $500
  • · Replies 15 ·
Replies
15
Views
5K
Graduate Can we expect stars to become visible only in infrared after a while?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Does Matter Truly Occupy Space or is it Merely Energy in a Certain State?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate For how long the Cosmic Microwave Background was emitted?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Can Gravity Act Faster Than Light?
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Why is Mars so easily visible to the naked eye?
  • · Replies 8 ·
Replies
8
Views
5K
Undergrad What Form Does Matter Take When a Star 'Explodes'?
  • · Replies 11 ·
Replies
11
Views
5K
Undergrad See far away objects in space in real time?
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Coincidence of asteroid and Russian meteor at same time.
  • · Replies 10 ·
Replies
10
Views
5K
Undergrad Is the Moon's Orbit Influenced by Earth's Warped Space and Tidal Friction?
  • · Replies 16 ·
Replies
16
Views
10K
Graduate What Are the Key Experiments for Investigating Redshift Anomalies?
  • · Replies 14 ·
Replies
14
Views
7K
Undergrad Calculate the equatorial rotation velocity
  • · Replies 8 ·
Replies
8
Views
6K
Undergrad Kepler's 3rd law - which object in numerator?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Is the Expansion of the Universe Accelerating Beyond the Speed of Light?
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Do planets wave in their orbits?
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Astronomy paper help - professor doesn't understand my wording
  • · Replies 15 ·
Replies
15
Views
4K
High School Solar system is bigger than previously thought
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Could You Have Spotted the TanDEM-X Satellites Near Saturn?
  • · Replies 5 ·
Replies
5
Views
4K
High School Can you recommend any resources for Astronomy?
  • · Replies 4 ·
Replies
4
Views
3K
High School Why doesn't the moon eventually drift into space?
  • · Replies 9 ·
Replies
9
Views
4K
Graduate Earliest Rocky Planets: Timeframe & Info
  • · Replies 10 ·
Replies
10
Views
4K
Graduate Travel to another moon/planet/gravitational body
  • · Replies 4 ·
Replies
4
Views
2K
High School Can We See If A Planet Is Inhabited 1 Million Lightyears away?
  • · Replies 12 ·
Replies
12
Views
5K
Graduate How do Trojan Asteroids effect a planets' orbits
  • · Replies 10 ·
Replies
10
Views
3K
Experience the Incredible Descent onto Titan: How Did They Do It?
  • · Replies 7 ·
Replies
7
Views
4K
Graduate What is the fabric of the universe?
  • · Replies 45 ·
2
Replies
45
Views
40K
Graduate Auroral Mechanism: Questions Answered
  • · Replies 2 ·
Replies
2
Views
4K
Undergrad Looking for a good analogy of the shape of the expanding universe
  • · Replies 3 ·
Replies
3
Views
3K
Third Van Allen Belt Discovered - NASA Probes
  • · Replies 3 ·
Replies
3
Views
2K
Graduate What Are the Processes for Manufacturing Elements Heavier Than Iron in Stars?
  • · Replies 14 ·
Replies
14
Views
3K
Undergrad C/2013 A1: Weight Estimation & Final Trajectory
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Universe older than thought? Or big bang theory wrong?
  • · Replies 26 ·
Replies
26
Views
8K
High School How is one black hole is larger than another?
  • · Replies 2 ·
Replies
2
Views
2K
High School Comets in the Northern Hemisphere vs the Southern?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate What happens when a black hole devours another black hole?
  • · Replies 19 ·
Replies
19
Views
7K
Undergrad Why are MACHOs in the Halo not the disk
  • · Replies 8 ·
Replies
8
Views
3K
Graduate Opinion: Double Degeneracy Model for SN Ia Progenitors
  • · Replies 1 ·
Replies
1
Views
2K
Graduate What is the significance of the Jeans length in cloud collapse?
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad When did nuclear fusion in the sun really start ?
  • · Replies 8 ·
Replies
8
Views
7K
Undergrad Help Solve Supernova Assignment | Astro Community
  • · Replies 3 ·
Replies
3
Views
2K