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.
Comparing Angular Rates of Star Rotation at Different Latitudes and Longitudes
Replies
2
Views
4K
What is the Iron Mass in the Main Asteroid Belt?
Replies
2
Views
5K
What fuels Io's volcanic activity?
Replies
17
Views
9K
Calculating Orbit Parameters Given Perigee Velocity and Period
Replies
3
Views
4K
Gravity Decrease in Discs: Rate Explained
Replies
4
Views
3K
Project Help - Distribution of AGN in a particular cluster
Replies
3
Views
3K
Is there any limit on how far light can travel -in a vaccuum that is.
Replies
5
Views
3K
Star density calculation = weird result.
Replies
2
Views
3K
Understanding the Changing Density of the Sun's Core
Replies
2
Views
4K
What Innovative Astrophysics Project Ideas Can Reflect a Student's Creativity?
Replies
5
Views
6K
How do nuclear powered space craft generate thrust?
Replies
8
Views
5K
Seeding a Solar System Simulation
Replies
19
Views
10K
How Do We Get Clear Images of Galaxies Despite the Light Travel Time Difference?
Replies
12
Views
4K
Calculating the distance of the moon in Newton's day
Replies
2
Views
8K
Speculations and hypotheses about Theia
Replies
2
Views
4K
Waterworlds: A Rarity Among Terrestrial Planets?
Replies
8
Views
5K
Why would we ever terraform if we can develop cyborgs?
Replies
16
Views
7K
Using magnetic fields in place of heat shielding
Replies
6
Views
8K
Is the Red Square Nebula MWC 922 Really a Hypercube?
Replies
6
Views
5K
Stargazing Why Not Leave Hubble in Space Until It Fails?
Replies
2
Views
3K
Gravitational Lensing or Inferior Mirage?
Replies
3
Views
2K
Are Phantom Planets Counterbalancing Our Solar System?
Replies
14
Views
5K
Instead of a space elevator a well
Replies
12
Views
5K
Are Sedimentary Layers the Cause of Banding on Asteroid Vesta?
Replies
2
Views
3K
Light in intergalctic space/ voids
Replies
5
Views
5K
A Problem with (Almost) Universal Red Shift
Replies
3
Views
3K
Lower mass limit for neutron stars?
Replies
5
Views
7K
Why dark matter can not collapse into a blackhole?
Replies
6
Views
5K
Is the Motion of Dark Matter Subhalos Random or Patterned?
Replies
1
Views
3K
Could the Moon be the cooled remains of a planets core?
Replies
10
Views
5K
First orbit of an asteroid this month (around Vesta, with ion drive)
Replies
9
Views
5K
Can someone explain to me exactly what is meant by vanishing dimensions theory?
Replies
1
Views
4K
Dimensions that are not space dimensions nor time dimensions.
Replies
14
Views
7K
New Mars rover launch 2011 (Curiosity, YouTube, eta August 2012))
Replies
3
Views
5K
Alfven Waves Drive Coronal Heat + Solar Wind
Replies
2
Views
3K
How Does Pressure Influence Nebulae in N-Body Simulations?
Replies
1
Views
4K
Predicting the Location of a Star Within an Image
Replies
1
Views
4K
How much force is needed to move a planet.
Replies
11
Views
25K
What Are the Latest Discoveries About Pluto's Moons?
Replies
8
Views
5K
Kronberger 61 and Planetary Nebulae
Replies
1
Views
4K
Is It Possible to Explore the Entire Universe?
Replies
24
Views
8K
What is the mysterious asteroid that has been tagging along with Earth?
Replies
16
Views
16K
Is weightlessness in orbit just a result of horizontal velocity?
Replies
7
Views
5K
Stargazing Which are the top telescope producers
Replies
10
Views
4K
Super Novae and emission of electromagnetic waves and gravitation wavefronts
Replies
22
Views
5K
What is the Significance of the K Line of Ca II in 1934POMic?
Replies
1
Views
2K
Space Expansion/Time Travel (#IMAN00B)
Replies
3
Views
3K
Cosmic horizon of 42-billion light-years?
Replies
1
Views
6K
CMB, The Horizon Problem and a comment on BH's
Replies
36
Views
9K
Observational evidence for bottom-up structure formation
Replies
2
Views
4K
How to Get Intense Light Star for Spectrum Analysis
Replies
2
Views
3K
Do we see galaxies the way they really are ?
Replies
12
Views
7K
Stefan-boltzmann solved for temperature?
Replies
8
Views
6K
Illuminated fraction of the Moon
Replies
5
Views
15K
Stargazing Observing the sun with Newton telescope
Replies
10
Views
9K
Calculating Sun's Speed and Movement: A Query on Theories of Light
Replies
10
Views
5K
What is the impact of light particles on the universe's weight and energy?
Replies
8
Views
4K
ET phone home or anywhere really
Replies
14
Views
4K
Is Motion Relative?: A Look at Helio/Geo Centric Fundamentals
Replies
17
Views
5K
Another *Life Might Be Rare* paper
Replies
3
Views
4K
Speed of light is it really constant?
Replies
5
Views
3K
Sunset & Sunrise Times | Free Software
Replies
4
Views
3K
Difference between a Gravity Well and a Black Hole
Replies
20
Views
17K
Could the combined gravity of the Universe create an event horizon?
Replies
12
Views
5K
Releasing the object from Space Elevator
Replies
5
Views
5K
Why Are U-B and B-V Values Important in Studying Stars and Clusters?
Replies
4
Views
4K
Physics puzzle: A 1 radius 7 billion K temp. ball is activated inside Jupiter
Replies
5
Views
3K
Could gravity affect human evolution?
Replies
3
Views
5K
Tidal Locked to a Red Dwarf? What Would the Calendar Look Like?
Replies
9
Views
5K
Stargazing Upgrading my telescope, need advice.
Replies
6
Views
5K
Radio Astronomy. Baselines and Fringes, Interferometry
Replies
4
Views
3K
What Causes the Illusion of Planets Moving Backwards in the Sky?
Replies
3
Views
4K
Is Nemesis a Real Companion Star to Our Sun?
Replies
6
Views
4K
Calculating Gravitational Energy
Replies
5
Views
3K
Position angle of Moon's bright limb (formula)
Replies
5
Views
10K
How does the jetstream of particles manage to escape from the blackhole?
Replies
12
Views
5K
Black Holes Schwarzschild radius
Replies
7
Views
4K
Some questions about the Universe and its expansion.
Replies
10
Views
5K
Dark energy - Expansion of the universe
Replies
10
Views
5K
Why aren't the <v^2> and <vr^2> curves different in my Hernquist model?
Replies
1
Views
2K
Do sound vibrations from plate tectonics (earthquakes) attract asteroids?
Replies
2
Views
3K
12 min orbit white dwarfs found Best target for gravitational waves
Replies
4
Views
3K
Stargazing Telescope Filters: Is Something Missing?
Replies
8
Views
5K
Into what shape does an orbiting sphere get distorted by tidal forces?
Replies
4
Views
4K
Information on first planets formed in the universe
Replies
1
Views
3K
Where Can I Find Accurate Data for Simulating Solar System Orbits in Java?
Replies
4
Views
4K
Electro magnetic craft levitation at earths magnetic pole possible?
Replies
1
Views
5K
How would you steer a spacecraft?
Replies
22
Views
15K
Find Orbital Elements given Orbital State Vectors
Replies
7
Views
14K
The star Betelgeuse going supernova soon?
Replies
35
Views
33K
How accurate are simple models of the solar system?
Replies
13
Views
8K
Magnetic Fields on Sudarsky Class II Gas Giants
Replies
1
Views
3K
Interested in looking at the night sky
Replies
4
Views
4K
Correct Physics for Fictional World
Replies
3
Views
4K
What Determines the Size and Growth of a Black Hole?
Replies
6
Views
4K
Collisional Astrophysics Models for Computer Scientists
Replies
2
Views
2K
Lunar solstice when the Moon's Equator crosses the Zero Plane of the Earth
Replies
1
Views
4K
Potential Cancellation of the JWST
Replies
3
Views
4K
Objects in orbit are weightless?
Replies
9
Views
5K
If somehow a supernova will be redirected to 30, 45, 60, 80, 90
Replies
6
Views
4K