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.
Where Can I See the Milky Way Near Washington DC?
  • · Replies 7 ·
Replies
7
Views
3K
High School Huge amounts of water ice found on Mars
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Euclidean differential number counts of supernovae
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Black Hole Formation: Fermion Pressure & Neutron Stars
  • · Replies 14 ·
Replies
14
Views
2K
High School How to measure the amount of gravitational lensing?
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad System simplification through state space
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Objective classification of spiral galaxies
  • · Replies 1 ·
Replies
1
Views
2K
High School If energy is created with expansion and it has no limit....?
  • · Replies 17 ·
Replies
17
Views
3K
High School Why gas clouds collapse if the forces are conservative?
  • · Replies 15 ·
Replies
15
Views
2K
Undergrad Are Red Dwarfs Home to Earth-Sized Water Worlds?
  • · Replies 23 ·
Replies
23
Views
5K
Stargazing North American nebula from this past summer
  • · Replies 3 ·
Replies
3
Views
2K
High School If an object runs an infinite distance in universe....?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad RA and declination of Sun & phase of Moon program
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Collapsing Nebulae: Outward Force of Gas Explained
  • · Replies 2 ·
Replies
2
Views
1K
Stargazing Supermoon Monday: Closest Approach in 70 Years
  • · Replies 30 ·
2
Replies
30
Views
4K
Stargazing Dust on the Mirror: Is Cleaning Worth the Risk?
  • · Replies 19 ·
Replies
19
Views
4K
Stargazing Is Your Camera's Sensor CCD or CMOS?
  • · Replies 26 ·
Replies
26
Views
5K
High School Flatlanders in the 3rd dimension "Hyperspace"
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Why exactly does the ocean bulge on both sides of the Earth?
  • · Replies 7 ·
Replies
7
Views
2K
High School When are we "trailing" the Sun in its galactic revolution?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Dark Energy: How Can ~73% Of Universe Exist?
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Why is the ISS at a 51.6 degree orbital inclination?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad China launches X-ray Pulsar NAVigation satellite
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Is Constant Mass Density in the Universe Linked to the Casimir Effect?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Are all planets in our Solar System in the same plane?
  • · Replies 6 ·
Replies
6
Views
7K
Undergrad Revolutionize Space Travel with Innovative Vacuum Launch Method
  • · Replies 10 ·
Replies
10
Views
3K
Graduate Velocity Dispersion: Meaning & Difference Explained
  • · Replies 2 ·
Replies
2
Views
2K
High School Rosetta's comet mission discussion thread
  • · Replies 205 ·
7
Replies
205
Views
31K
Undergrad Debunking Interstellar Travel: Separating Fact from Fiction
  • · Replies 248 ·
9
Replies
248
Views
24K
Undergrad Calculating the Rotation Curves of Galactic Disks
  • · Replies 1 ·
Replies
1
Views
2K
High School Methods of accelerating in space?
  • · Replies 3 ·
Replies
3
Views
1K
High School How Are Images of Gravity Dips in Space Created Without a Sense of Direction?
  • · Replies 37 ·
2
Replies
37
Views
5K
High School Why the Milky Way shows band in all-sky energy scans
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Moon's End: What's the Scenario?
  • · Replies 16 ·
Replies
16
Views
2K
Undergrad Is the space elevator affected by lightening, sprites, emf?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Advanced Aliens Are In Happiness Boxes: Why SETI Must Fail
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad What Were Earth's Rotation Rate and Tilt Before and After the Theia Impact?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Would a larger Martian moon create a stronger magnetic field
  • · Replies 3 ·
Replies
3
Views
2K
Stargazing How do we know how bright a cepheid variable star is?
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Simulating Binary Systems with RK4 in C
  • · Replies 4 ·
Replies
4
Views
2K
High School How could we "reactivate" Mars' magnetic field?
  • · Replies 8 ·
Replies
8
Views
2K
Stargazing What telescopes are good for seeing planets and galaxies?
  • · Replies 10 ·
Replies
10
Views
4K
Undergrad Does spacetime have potential energy?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Take FFT to find time period for eclipsing binaries
  • · Replies 1 ·
Replies
1
Views
2K
High School Why do areas near the poles experience semidiurnal tides?
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Where is the matter in a black hole?
  • · Replies 83 ·
3
Replies
83
Views
12K
High School Prediction: A Red Nova May Rival Polaris in 2022
  • · Replies 1 ·
Replies
1
Views
2K
High School Terraforming Venus: Why Nobody Discusses It?
  • · Replies 71 ·
3
Replies
71
Views
12K
Undergrad Question about Relatavistic mass
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Largest Hard Planet of Gravity 1g we have ever Discovered?
  • · Replies 21 ·
Replies
21
Views
5K
High School MARVELS Discovery: 1 Giant Planet & 'Failed Star' Found
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Kepler 3rd law for circular orbits
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Why is Mercury Visible at Night?
  • · Replies 18 ·
Replies
18
Views
12K
High School Do Stars Experience Precession Like Our Sun?
  • · Replies 1 ·
Replies
1
Views
1K
High School Need confirmation of planetary distances
  • · Replies 3 ·
Replies
3
Views
1K
Graduate What is orientation of a needle shaped spacecraft?
  • · Replies 30 ·
2
Replies
30
Views
4K
High School Line absorption spectrum and stars
  • · Replies 9 ·
Replies
9
Views
2K
Graduate What if i do not go into orbit but close in on a langrange p
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad How to draw figures and diagrams?
  • · Replies 8 ·
Replies
8
Views
4K
Undergrad Modeling a Binary Asteroid System Around the Sun
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Can dark matter explain Tully-Fisher relation & new paper
  • · Replies 24 ·
Replies
24
Views
5K
Stargazing Advanced Astrophotography - Comments
  • · Replies 2 ·
Replies
2
Views
2K
Stargazing The James Webb Space Telescope construction
  • · Replies 31 ·
2
Replies
31
Views
7K
High School Is a lunar space elevator a realistic proposition?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Open access papers in JGR-Planets
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad How can Andromeda collide with the Milky Way?
  • · Replies 4 ·
Replies
4
Views
2K
High School Uranus May Have Two Dark Unseen Moons
  • · Replies 2 ·
Replies
2
Views
1K
High School The aliens are silent because they are dead
  • · Replies 31 ·
2
Replies
31
Views
5K
High School The news media on 2 trillion galaxies: Confused, or am I?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Why don't any stars "look" red? red shift
  • · Replies 7 ·
Replies
7
Views
4K
Stargazing Intermediate Astrophotography - Comments
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad How did Tycho Brahe measure time?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Solar System Origins: Angular Momentum Problem?
  • · Replies 1 ·
Replies
1
Views
2K
Stargazing Seeing Uranus - Two Nights of Celestial Wonders
  • · Replies 12 ·
Replies
12
Views
2K
Graduate Finding an exoplanet via its magnetosphere's effect on starlight?
  • · Replies 11 ·
Replies
11
Views
3K
Stargazing Introduction to Astrophotography - Comments
  • · Replies 1 ·
Replies
1
Views
2K
High School Found: The Least Luminous Galaxy Ever Seen
  • · Replies 4 ·
Replies
4
Views
2K
High School Gravitational wave signal duration
  • · Replies 4 ·
Replies
4
Views
2K
Stargazing How can the telescopes take photos of distant galaxies?
  • · Replies 6 ·
Replies
6
Views
2K
High School Where is the Void? Universe Big Bang & Expansion
  • · Replies 27 ·
Replies
27
Views
5K
Graduate Types and Common Names of NGC/IC objects
  • · Replies 3 ·
Replies
3
Views
2K
Stargazing How to build an optical telescope for research?
  • · Replies 18 ·
Replies
18
Views
3K
High School Black Holes and The End of Spacetime
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad What Causes Distinct Absorption Bands in the Sun's Spectrum During Sunset?
  • · Replies 5 ·
Replies
5
Views
2K
High School Space Finite? Inconceivable - Thoughts?
  • · Replies 1 ·
Replies
1
Views
1K
High School Unusual Exoplanet Discovery Using Star Pulsations: KIC 7917485b
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Plotting the orbits of the planets
  • · Replies 2 ·
Replies
2
Views
4K
Undergrad What computer science would you need for astrophysics?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Gravitational acceleration and the baryon distribution
  • · Replies 5 ·
Replies
5
Views
2K
High School Is Spacetime Actually a Superfluid?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Light fluctuations and finding exoplanets
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Gravitating particles and entropy
  • · Replies 16 ·
Replies
16
Views
2K
High School Unsolved Mystery: Where Do These X-Rays Come From?
  • · Replies 4 ·
Replies
4
Views
2K
High School When to see aurora borealis in Lincoln, NE?
  • · Replies 5 ·
Replies
5
Views
3K
High School 'Strong signal' from sun-like star sparks alien speculation
  • · Replies 32 ·
2
Replies
32
Views
6K
High School Does water pressure decrease in zero gravity?
  • · Replies 13 ·
Replies
13
Views
6K
Undergrad Lunar versus Solar orbit at solstices
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Need help with some calculations with gravitational waves
  • · Replies 4 ·
Replies
4
Views
2K
Graduate New Radial Velocity Experiment (RAVE) Data Release
  • · Replies 2 ·
Replies
2
Views
2K
Graduate How much energy to fly Spaceships from sci -fi movies
  • · Replies 1 ·
Replies
1
Views
2K