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 Forces and factors which act upon masses as they aproach c, and how they do so.
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Power transmission through space
  • · Replies 2 ·
Replies
2
Views
3K
Is Colonizing the Sun Possible in the Distant Future?
  • · Replies 16 ·
Replies
16
Views
12K
Graduate Finite Universe: Light speed and the Earth's distance/time from event
  • · Replies 6 ·
Replies
6
Views
8K
Graduate Does a Comet Speed Up Near the Sun or Does Time and Space Compress?
  • · Replies 4 ·
Replies
4
Views
5K
Undergrad Silicon in Space: Robotics Applications Research
  • · Replies 1 ·
Replies
1
Views
3K
Undergrad Hypothetical question: Meteor hitting Earth
  • · Replies 4 ·
Replies
4
Views
4K
Undergrad How do I calculate a planets mass?
  • · Replies 5 ·
Replies
5
Views
19K
Stargazing How to find the Point Spread Function of a Newtonian Telescope?
  • · Replies 2 ·
Replies
2
Views
4K
Astronomy vs Astrology: A Comparison | Physics 191 Book Cover and Side Photo
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Visibility of a solar shade from a planetary surface
  • · Replies 14 ·
Replies
14
Views
3K
Graduate Why is Earth made of Iron and Stone?
  • · Replies 7 ·
Replies
7
Views
5K
Graduate How Do Gravitational Waves Interact with Black Holes and Binary Pulsars?
  • · Replies 4 ·
Replies
4
Views
4K
Undergrad Speed of light vs. the universe's inflation
  • · Replies 5 ·
Replies
5
Views
4K
Undergrad Comparing Angular Rates of Star Rotation at Different Latitudes and Longitudes
  • · Replies 2 ·
Replies
2
Views
4K
Undergrad What is the Iron Mass in the Main Asteroid Belt?
  • · Replies 2 ·
Replies
2
Views
5K
Graduate What fuels Io's volcanic activity?
  • · Replies 17 ·
Replies
17
Views
9K
Undergrad Calculating Orbit Parameters Given Perigee Velocity and Period
  • · Replies 3 ·
Replies
3
Views
4K
Undergrad Gravity Decrease in Discs: Rate Explained
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Project Help - Distribution of AGN in a particular cluster
  • · Replies 3 ·
Replies
3
Views
3K
High School Is there any limit on how far light can travel -in a vaccuum that is.
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Star density calculation = weird result.
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Understanding the Changing Density of the Sun's Core
  • · Replies 2 ·
Replies
2
Views
4K
Undergrad What Innovative Astrophysics Project Ideas Can Reflect a Student's Creativity?
  • · Replies 5 ·
Replies
5
Views
6K
Undergrad How do nuclear powered space craft generate thrust?
  • · Replies 8 ·
Replies
8
Views
5K
Graduate Seeding a Solar System Simulation
  • · Replies 19 ·
Replies
19
Views
11K
Graduate How Do We Get Clear Images of Galaxies Despite the Light Travel Time Difference?
  • · Replies 12 ·
Replies
12
Views
4K
High School Calculating the distance of the moon in Newton's day
  • · Replies 2 ·
Replies
2
Views
8K
Undergrad Speculations and hypotheses about Theia
  • · Replies 2 ·
Replies
2
Views
4K
Undergrad Waterworlds: A Rarity Among Terrestrial Planets?
  • · Replies 8 ·
Replies
8
Views
5K
Undergrad Why would we ever terraform if we can develop cyborgs?
  • · Replies 16 ·
Replies
16
Views
7K
Graduate Using magnetic fields in place of heat shielding
  • · Replies 6 ·
Replies
6
Views
9K
Graduate Is the Red Square Nebula MWC 922 Really a Hypercube?
  • · Replies 6 ·
Replies
6
Views
6K
Stargazing Why Not Leave Hubble in Space Until It Fails?
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Gravitational Lensing or Inferior Mirage?
  • · Replies 3 ·
Replies
3
Views
2K
High School Are Phantom Planets Counterbalancing Our Solar System?
  • · Replies 14 ·
Replies
14
Views
5K
Graduate Instead of a space elevator a well
  • · Replies 12 ·
Replies
12
Views
5K
Undergrad Are Sedimentary Layers the Cause of Banding on Asteroid Vesta?
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Light in intergalctic space/ voids
  • · Replies 5 ·
Replies
5
Views
5K
Graduate A Problem with (Almost) Universal Red Shift
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Lower mass limit for neutron stars?
  • · Replies 5 ·
Replies
5
Views
7K
Graduate Why dark matter can not collapse into a blackhole?
  • · Replies 6 ·
Replies
6
Views
5K
Graduate Is the Motion of Dark Matter Subhalos Random or Patterned?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Could the Moon be the cooled remains of a planets core?
  • · Replies 10 ·
Replies
10
Views
5K
High School First orbit of an asteroid this month (around Vesta, with ion drive)
  • · Replies 9 ·
Replies
9
Views
5K
Graduate Can someone explain to me exactly what is meant by vanishing dimensions theory?
  • · Replies 1 ·
Replies
1
Views
4K
Graduate Dimensions that are not space dimensions nor time dimensions.
  • · Replies 14 ·
Replies
14
Views
7K
New Mars rover launch 2011 (Curiosity, YouTube, eta August 2012))
  • · Replies 3 ·
Replies
3
Views
5K
Graduate Alfven Waves Drive Coronal Heat + Solar Wind
  • · Replies 2 ·
Replies
2
Views
4K
Graduate How Does Pressure Influence Nebulae in N-Body Simulations?
  • · Replies 1 ·
Replies
1
Views
4K
Graduate Predicting the Location of a Star Within an Image
  • · Replies 1 ·
Replies
1
Views
4K
Undergrad How much force is needed to move a planet.
  • · Replies 11 ·
Replies
11
Views
25K
Undergrad What Are the Latest Discoveries About Pluto's Moons?
  • · Replies 8 ·
Replies
8
Views
5K
Undergrad Kronberger 61 and Planetary Nebulae
  • · Replies 1 ·
Replies
1
Views
4K
Undergrad Is It Possible to Explore the Entire Universe?
  • · Replies 24 ·
Replies
24
Views
9K
High School What is the mysterious asteroid that has been tagging along with Earth?
  • · Replies 16 ·
Replies
16
Views
16K
Undergrad Is weightlessness in orbit just a result of horizontal velocity?
  • · Replies 7 ·
Replies
7
Views
5K
Stargazing Which are the top telescope producers
  • · Replies 10 ·
Replies
10
Views
5K
Graduate Super Novae and emission of electromagnetic waves and gravitation wavefronts
  • · Replies 22 ·
Replies
22
Views
5K
Graduate What is the Significance of the K Line of Ca II in 1934POMic?
  • · Replies 1 ·
Replies
1
Views
2K
High School Space Expansion/Time Travel (#IMAN00B)
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Cosmic horizon of 42-billion light-years?
  • · Replies 1 ·
Replies
1
Views
6K
Graduate Would a Deimos/Phobos orbital resonance affect Mars?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate CMB, The Horizon Problem and a comment on BH's
  • · Replies 36 ·
2
Replies
36
Views
9K
Graduate Observational evidence for bottom-up structure formation
  • · Replies 2 ·
Replies
2
Views
4K
Undergrad How to Get Intense Light Star for Spectrum Analysis
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Do we see galaxies the way they really are ?
  • · Replies 12 ·
Replies
12
Views
7K
Undergrad Stefan-boltzmann solved for temperature?
  • · Replies 8 ·
Replies
8
Views
6K
Undergrad Illuminated fraction of the Moon
  • · Replies 5 ·
Replies
5
Views
15K
Stargazing Observing the sun with Newton telescope
  • · Replies 10 ·
Replies
10
Views
9K
Undergrad Calculating Sun's Speed and Movement: A Query on Theories of Light
  • · Replies 10 ·
Replies
10
Views
5K
Graduate What is the impact of light particles on the universe's weight and energy?
  • · Replies 8 ·
Replies
8
Views
4K
Undergrad ET phone home or anywhere really
  • · Replies 14 ·
Replies
14
Views
4K
Graduate Moving Phobos to join Deimos for single moon.
  • · Replies 53 ·
2
Replies
53
Views
10K
Undergrad Is Motion Relative?: A Look at Helio/Geo Centric Fundamentals
  • · Replies 17 ·
Replies
17
Views
5K
Graduate Another *Life Might Be Rare* paper
  • · Replies 3 ·
Replies
3
Views
4K
Undergrad Speed of light is it really constant?
  • · Replies 5 ·
Replies
5
Views
3K
Sunset & Sunrise Times | Free Software
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Difference between a Gravity Well and a Black Hole
  • · Replies 20 ·
Replies
20
Views
17K
Graduate Could the combined gravity of the Universe create an event horizon?
  • · Replies 12 ·
Replies
12
Views
5K
Graduate Releasing the object from Space Elevator
  • · Replies 5 ·
Replies
5
Views
5K
Undergrad Why Are U-B and B-V Values Important in Studying Stars and Clusters?
  • · Replies 4 ·
Replies
4
Views
4K
Graduate Physics puzzle: A 1 radius 7 billion K temp. ball is activated inside Jupiter
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Could gravity affect human evolution?
  • · Replies 3 ·
Replies
3
Views
5K
Graduate Tidal Locked to a Red Dwarf? What Would the Calendar Look Like?
  • · Replies 9 ·
Replies
9
Views
6K
Stargazing Upgrading my telescope, need advice.
  • · Replies 6 ·
Replies
6
Views
6K
Graduate Radio Astronomy. Baselines and Fringes, Interferometry
  • · Replies 4 ·
Replies
4
Views
3K
High School What Causes the Illusion of Planets Moving Backwards in the Sky?
  • · Replies 3 ·
Replies
3
Views
4K
Undergrad Is Nemesis a Real Companion Star to Our Sun?
  • · Replies 6 ·
Replies
6
Views
4K
Undergrad Calculating Gravitational Energy
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Position angle of Moon's bright limb (formula)
  • · Replies 5 ·
Replies
5
Views
10K
Graduate How does the jetstream of particles manage to escape from the blackhole?
  • · Replies 12 ·
Replies
12
Views
5K
Undergrad Black Holes Schwarzschild radius
  • · Replies 7 ·
Replies
7
Views
4K
High School Some questions about the Universe and its expansion.
  • · Replies 10 ·
Replies
10
Views
5K
Undergrad Dark energy - Expansion of the universe
  • · Replies 10 ·
Replies
10
Views
5K
Graduate Why aren't the <v^2> and <vr^2> curves different in my Hernquist model?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Black Holes : Zero Volume, Infinite Density
  • · Replies 6 ·
Replies
6
Views
12K
Graduate Do sound vibrations from plate tectonics (earthquakes) attract asteroids?
  • · Replies 2 ·
Replies
2
Views
3K
Graduate 12 min orbit white dwarfs found Best target for gravitational waves
  • · Replies 4 ·
Replies
4
Views
3K
Stargazing Telescope Filters: Is Something Missing?
  • · Replies 8 ·
Replies
8
Views
5K