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 Connecting two points in the Universe?
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad Is it possible I saw a luminous cosmic ray track?
  • · Replies 2 ·
Replies
2
Views
2K
High School Why Can't We See Stars Beyond Earth?
  • · Replies 13 ·
Replies
13
Views
4K
Undergrad How Long Do Black Holes Last Before Vaporizing?
  • · Replies 9 ·
Replies
9
Views
7K
Undergrad Pluto's New Moon and Potential Collision Risks for New Horizons Probe
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad How Do You Calculate Angular Separation of Stars Using Different Coordinates?
  • · Replies 3 ·
Replies
3
Views
18K
Undergrad How Does the Gravitational Force Equation Change with 1/r^3?
  • · Replies 1 ·
Replies
1
Views
4K
RIP - Sally Ride - first American woman in space
  • · Replies 7 ·
Replies
7
Views
2K
Excellent Exoplanet Illustration
  • · Replies 27 ·
Replies
27
Views
6K
High School Half of moon fluctuates in luminosity and hue randomly, why?
  • · Replies 3 ·
Replies
3
Views
4K
Someone please explain this Sun Phenomenon
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Is the Drake Equation Overestimating Intelligent Life in the Universe?
  • · Replies 18 ·
Replies
18
Views
6K
Graduate Could a Star Collapse into a Quark Star Instead of a Black Hole?
  • · Replies 3 ·
Replies
3
Views
3K
High School Looking further and further into the past?
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Fields permeating spacetime - aether?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Does time move faster while measured from space or from earth?
  • · Replies 10 ·
Replies
10
Views
4K
Graduate If the moon was vapourised, would it recondense or get blown away by solar wind?
  • · Replies 8 ·
Replies
8
Views
3K
Stargazing How Do I Choose the Right Optical Lenses for Building a Telescope?
  • · Replies 4 ·
Replies
4
Views
3K
Stargazing Problem about calculating focal length of a telescope
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Interstellar Medium Around Sol / Interstellar Ramscoop
  • · Replies 7 ·
Replies
7
Views
4K
Undergrad 10 light years but destroyed 6000 years ago?
  • · Replies 7 ·
Replies
7
Views
6K
Graduate How is energy/matter density distributed through the universe?
  • · Replies 4 ·
Replies
4
Views
4K
Undergrad What is the width of the Lagrange points?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate How much mass does 'Dark Matter' and 'Nothing' (empty space) have?
  • · Replies 6 ·
Replies
6
Views
4K
Graduate Proposed dark matter detector - how does it work?
  • · Replies 11 ·
Replies
11
Views
4K
Graduate Can Space Expand Faster Than the Speed of Light?
  • · Replies 10 ·
Replies
10
Views
3K
Undergrad Do scientists know why planets orbit stars on the same dimentional plane?
  • · Replies 4 ·
Replies
4
Views
5K
Graduate Size/Mass of a planet needed in order to have a molten core or a magnetic field?
  • · Replies 3 ·
Replies
3
Views
4K
Undergrad Speed Of Light In Relation To The Size Of The Universe
  • · Replies 8 ·
Replies
8
Views
4K
Undergrad When did they discover the Gas Giants were fluid?
  • · Replies 4 ·
Replies
4
Views
7K
Graduate Kepler's Equation and its choices
  • · Replies 9 ·
Replies
9
Views
3K
High School How many degrees of view is cosmic microwave background?
  • · Replies 3 ·
Replies
3
Views
2K
High School How do you define a planet's rotation?
  • · Replies 12 ·
Replies
12
Views
4K
Graduate Pulsar Spectrum: The Mystery of Neutron Star's Black Body Emission Revealed
  • · Replies 2 ·
Replies
2
Views
4K
Undergrad What happens to you if you get pulled into a black hole?
  • · Replies 26 ·
Replies
26
Views
5K
Graduate How is it possible to live past the event horizon?
  • · Replies 19 ·
Replies
19
Views
6K
Graduate Creating Artificial Gravity for Spacecraft Travel
  • · Replies 5 ·
Replies
5
Views
3K
High School Night sky and supernova questions
  • · Replies 9 ·
Replies
9
Views
3K
Undergrad How is molecular hydrogen detected?
  • · Replies 95 ·
4
Replies
95
Views
20K
Undergrad Angular momentum and eccentricity
  • · Replies 2 ·
Replies
2
Views
5K
High School Pluto's color changes as it makes its closest approach?
  • · Replies 1 ·
Replies
1
Views
2K
Jumping into a earthcenter tunnel
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Speed through the universe we are moving?
  • · Replies 4 ·
Replies
4
Views
3K
Graduate What is the system of angular units used by astronomers of Venus?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Could we see Earth 75.2 years ago using light from a supermassive black hole?
  • · Replies 6 ·
Replies
6
Views
4K
High School What Were the Two Bright Yellow Lights in the Sky on July 10th?
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Can Negative Changes in Entropy Occur in the Universe?
  • · Replies 26 ·
Replies
26
Views
9K
High School Is the Universe Really Flat and What Lies Above or Below the Earth?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Other dimensions have been proven .
  • · Replies 15 ·
Replies
15
Views
6K
Graduate Measuring the Accuracy of EM Spectrum Shift: Red vs Blue
  • · Replies 11 ·
Replies
11
Views
5K
Undergrad Calculating orbits of moons, when both the planet and star are involved.
  • · Replies 8 ·
Replies
8
Views
5K
Graduate Does a Space Warp Bubble Move Through Space or Does Space Move Around It?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Post big bang matter/energy distribution
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Can black holes be disintegrated from a sufficiently powerful explosion?
  • · Replies 34 ·
2
Replies
34
Views
7K
Graduate Dark Matter - How strong is it at a galaxy periphery?
  • · Replies 1 ·
Replies
1
Views
3K
Undergrad Size of the Universe? I'm confused.
  • · Replies 7 ·
Replies
7
Views
5K
Undergrad Dark matter is the thread connecting galaxy clusters
  • · Replies 3 ·
Replies
3
Views
4K
Graduate Plotting planetary movements through space
  • · Replies 8 ·
Replies
8
Views
2K
Is This CM Book by Roy on Orbital Motion?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Calculating the Size of the Universe
  • · Replies 32 ·
2
Replies
32
Views
7K
Graduate Could dark matter be invisible bound states of ordinary matter or ehm, aliens?
  • · Replies 1 ·
Replies
1
Views
4K
Graduate Is the Universe Spinning? | General Relativity
  • · Replies 31 ·
2
Replies
31
Views
14K
Graduate Is the Sun's luminosity in specific filters greater than its overall luminosity?
  • · Replies 1 ·
Replies
1
Views
3K
Undergrad Venus Spinning Slower Than Thought
  • · Replies 25 ·
Replies
25
Views
7K
Graduate Exploring the Properties of Gravitational Waves: Evidence, Structure, and Speed
  • · Replies 6 ·
Replies
6
Views
4K
Undergrad What if time is not linear? Can it be experienced out of sequence?
  • · Replies 7 ·
Replies
7
Views
5K
Graduate Calculating Force and Energy Requirements for a Reactionless Drive in Space
  • · Replies 4 ·
Replies
4
Views
4K
Undergrad Is space really absolutely nothing?
  • · Replies 20 ·
Replies
20
Views
12K
Graduate Finding the Optimal Time to Launch a Mission to Mars
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Will Neutron Stars Last Forever Without Proton Decay?
  • · Replies 9 ·
Replies
9
Views
4K
Graduate Frustrated Over Tonight's Morgan Freeman Show
  • · Replies 15 ·
Replies
15
Views
5K
Graduate Relativistic Jets from Supermassive Black Holes?
  • · Replies 13 ·
Replies
13
Views
4K
Undergrad Are Black Holes Really Black and Just Holes?
  • · Replies 16 ·
Replies
16
Views
4K
Graduate Difference between outbursts and flares in X-ray accreting binaries
  • · Replies 1 ·
Replies
1
Views
2K
Graduate How do we know there is a timespace fabric?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Discovering the Shape of Spacetime from the Big Bang: A Scientific Exploration
  • · Replies 142 ·
5
Replies
142
Views
21K
Graduate Object Approaching Black Hole: Time Dilation & Visibility
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Gravitational waves and others contradictoriness
  • · Replies 9 ·
Replies
9
Views
3K
Undergrad First post a question about Black Holes and Gravity
  • · Replies 37 ·
2
Replies
37
Views
9K
Undergrad Acceleration due to gravity in a galaxy?
  • · Replies 5 ·
Replies
5
Views
4K
Graduate How Fast Do Stars Orbit in Different Galaxies?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Active Volcano in Venus: Unveiling the Mystery
  • · Replies 8 ·
Replies
8
Views
4K
Why Does My DSI Pro II Show a Black or Grey Screen?
  • · Replies 10 ·
Replies
10
Views
3K
High School For Just How Long Has the Periodicity of Halley's Comet Been Known?
  • · Replies 2 ·
Replies
2
Views
4K
Graduate Neutron Star Stability: Does Proton Crust Matter?
  • · Replies 31 ·
2
Replies
31
Views
6K
High School Has There Been a Recent Supernova in Andromeda?
  • · Replies 4 ·
Replies
4
Views
5K
Undergrad Matter, energy, space, time and gravity
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Could every possible universe exist somewhere ?
  • · Replies 16 ·
Replies
16
Views
5K
List of Astronomical Associations / Astrologist in USA
  • · Replies 1 ·
Replies
1
Views
2K
Who Decides Humanity's Space Destinations and Why?
  • · Replies 9 ·
Replies
9
Views
3K
High School Comet near the sun whose orbit is?
  • · Replies 7 ·
Replies
7
Views
6K
Undergrad What Powers a Supernova Explosion?
  • · Replies 2 ·
Replies
2
Views
2K
High School What happens to an empty can in space?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad How big and bright is the Sun seen from 120 AU?
  • · Replies 5 ·
Replies
5
Views
5K
Graduate Solar sailing Mercury into Venus
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Quantum Confusion - Does not exist until it's observed and age of universe
  • · Replies 3 ·
Replies
3
Views
4K
Graduate Constraints, Concept , Kant & Space
  • · Replies 6 ·
Replies
6
Views
4K
Stargazing Viewing night sky in the middle of a major city
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Can Time Exist Before the Big Bang?
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Should the Astronomical Unit be replaced by the Light Second/Light Minute Etc.?
  • · Replies 23 ·
Replies
23
Views
6K