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 Find a Map of Our Galaxy?
  • · Replies 7 ·
Replies
7
Views
3K
Apparent contradiction with orbital mechanics
  • · Replies 7 ·
Replies
7
Views
7K
Say Hi to Space in 24 Hours: Hover in a Helicopter
  • · Replies 7 ·
Replies
7
Views
2K
Stargazing Did You Know the Moon Dances for Us Every Month?
  • · Replies 4 ·
Replies
4
Views
5K
Stargazing Are You Prepared for the Upcoming Lunar Eclipse?
  • · Replies 17 ·
Replies
17
Views
4K
Will Mars Really Look as Big as the Moon on August 27, 2007?
  • · Replies 11 ·
Replies
11
Views
27K
Question: Mass distribution in galaxies
  • · Replies 3 ·
Replies
3
Views
6K
The Fascinating Truth About the Moon's Monthly Orbit Around the Earth
  • · Replies 3 ·
Replies
3
Views
3K
Hawking Radiation: Does an Astronaut Ever Cross the Horizon?
  • · Replies 1 ·
Replies
1
Views
3K
The Sun's Final Form: Radius, Mass & Composition
  • · Replies 2 ·
Replies
2
Views
7K
What Causes Symbiotic Novae to Re-Explode?
  • · Replies 4 ·
Replies
4
Views
6K
How do intense magnetic fields cause photons to split or merge?
  • · Replies 2 ·
Replies
2
Views
3K
Could a collision cause Venus to rotate prograde?
  • · Replies 2 ·
Replies
2
Views
3K
Stargazing Which Telescope Should I Buy for Astrophotography and Viewing?
  • · Replies 36 ·
2
Replies
36
Views
7K
Supermassive blackholes and galaxy formation.
  • · Replies 8 ·
Replies
8
Views
5K
Examining the Accuracy of "Moon's Orbit Around Earth"
  • · Replies 5 ·
Replies
5
Views
5K
Why Does the Sun's Surface Gravity Seem So Low Compared to Expectations?
  • · Replies 10 ·
Replies
10
Views
4K
What is the Astonishing Tail of Star Mira Discovered by NASA?
  • · Replies 3 ·
Replies
3
Views
3K
Gamma Ray Bursts: Nature & Why they Last 2 Seconds
  • · Replies 6 ·
Replies
6
Views
4K
Is the Sun an Ordinary or Atypical Star?
  • · Replies 2 ·
Replies
2
Views
3K
How Stars are Formed - Astronomy Basics
  • · Replies 2 ·
Replies
2
Views
19K
Stargazing What can I get to improve telescope
  • · Replies 47 ·
2
Replies
47
Views
21K
Spacetravel: t as a function of a and d
  • · Replies 24 ·
Replies
24
Views
4K
Stargazing Liquid Mirror Telescope: How to create a parabolic shape
  • · Replies 3 ·
Replies
3
Views
10K
What Are Gravity, Dark Matter, and Atoms?
  • · Replies 3 ·
Replies
3
Views
4K
What Are Some Recommended Graduate Level Texts on Stellar Spectroscopy?
  • · Replies 1 ·
Replies
1
Views
4K
Gravitational Waves: Origin & Mass Impact
  • · Replies 6 ·
Replies
6
Views
3K
Question re: Planets Facing Each Other
  • · Replies 1 ·
Replies
1
Views
3K
Let's try something-let me know if you have difficulty
  • · Replies 20 ·
Replies
20
Views
7K
A white dwarf formed by a supernova, possible?
  • · Replies 2 ·
Replies
2
Views
4K
How Can You Calculate the Area of Light Hitting a Dome?
  • · Replies 5 ·
Replies
5
Views
3K
When was the last time all inner planets aligned in our solar system?
  • · Replies 4 ·
Replies
4
Views
8K
Moon's Escape Point: Beyond Earth's Gravity
  • · Replies 11 ·
Replies
11
Views
6K
Water found on distant planet (hot Jupiter at 63 LY)
  • · Replies 5 ·
Replies
5
Views
4K
Using JPL Horizons to Obtain Inertial Positions and Velocities: A Tutorial
  • · Replies 2 ·
Replies
2
Views
4K
What is the accepted diameter of the universe?
  • · Replies 34 ·
2
Replies
34
Views
12K
Do you unfriend people on Facebook/Myspace?
  • · Replies 23 ·
Replies
23
Views
8K
Black Hole Radius: Facts & Theory
  • · Replies 12 ·
Replies
12
Views
4K
Does the Saros Cycle Provide Accurate Eclipse Predictions Across Time?
  • · Replies 5 ·
Replies
5
Views
4K
Model a Cooling Sphere: Finding Resources
  • · Replies 2 ·
Replies
2
Views
6K
Will cosmic microwave background disappear?
  • · Replies 2 ·
Replies
2
Views
5K
What is the empty space in an unopened 2 liter bottle of soda?
  • · Replies 11 ·
Replies
11
Views
3K
Stargazing Great Canary Telescope - First Light
  • · Replies 1 ·
Replies
1
Views
4K
UFO-Inspired Future Spacecraft: Faster Than Mach 4?
  • · Replies 6 ·
Replies
6
Views
3K
Selecting a Recent Space/Astro Physics Research Topic
  • · Replies 2 ·
Replies
2
Views
2K
Explore the Universe with Galaxy Zoo
  • · Replies 6 ·
Replies
6
Views
3K
Question regarding sun/moon angle
  • · Replies 5 ·
Replies
5
Views
8K
The Mystery of Aurora Borealis: Electron Acceleration
  • · Replies 10 ·
Replies
10
Views
6K
What can I see with my Sky Watcher telescope?
  • · Replies 6 ·
Replies
6
Views
3K
How to find any naked-eye object
  • · Replies 5 ·
Replies
5
Views
3K
Understanding the Expansion of the Universe Through Low Mass Star Death
  • · Replies 1 ·
Replies
1
Views
6K
Simulating the gravitational interaction between two material points
  • · Replies 3 ·
Replies
3
Views
2K
How would the solar system capture an extra solar planet ?
  • · Replies 14 ·
Replies
14
Views
15K
Taking Pictures From Outer Space: Color or B&W?
  • · Replies 4 ·
Replies
4
Views
3K
'Spinning' the truth about our own Moon?
  • · Replies 17 ·
Replies
17
Views
4K
Which Planets Are Visible Today?
  • · Replies 4 ·
Replies
4
Views
3K
Why the Moon Doesn't Fall on the Earth
  • · Replies 15 ·
Replies
15
Views
6K
Full Moon Height: When is It Highest?
  • · Replies 4 ·
Replies
4
Views
9K
Another Neptune in the Oort Cloud
  • · Replies 7 ·
Replies
7
Views
9K
Liftoff for Ceres and Vesta (July 2007)
  • · Replies 7 ·
Replies
7
Views
3K
Can MOND be ruled out at laboratory scale?
  • · Replies 7 ·
Replies
7
Views
4K
Collapsing Stars: White Dwarfs, Neutron Stars & Singularity
  • · Replies 2 ·
Replies
2
Views
3K
MOND-related Formula in GR Calcs at Cosmological Scale
  • · Replies 1 ·
Replies
1
Views
3K
What is the impact of the moon's mass on Earth's orbit around the sun?
  • · Replies 5 ·
Replies
5
Views
9K
Julian Days: Guide to Formula & Calculations
  • · Replies 4 ·
Replies
4
Views
3K
Is the Existence of Black Holes Debated Among Astrophysicists?
  • · Replies 10 ·
Replies
10
Views
5K
Mirror Grinding Kits: Wave Aspect Explained
  • · Replies 11 ·
Replies
11
Views
3K
Nice thumbnail sketch of Earth's future by John Baez
  • · Replies 10 ·
Replies
10
Views
4K
Theoretically Possible: Opening a Wormhole to Another Location
  • · Replies 12 ·
Replies
12
Views
5K
Unveiling the Mystery of Light: How Does it Move?
  • · Replies 30 ·
2
Replies
30
Views
7K
Video Recommendations for Black Holes & other space-related phenomena
  • · Replies 5 ·
Replies
5
Views
4K
Giant Solar Laser: Harnessing Energy from the Sun
  • · Replies 3 ·
Replies
3
Views
3K
Star Collapse: Why Not in Early Stages?
  • · Replies 2 ·
Replies
2
Views
4K
Calculate Star Radii: Mass, Luminosity & Temp
  • · Replies 7 ·
Replies
7
Views
3K
Uncovering the Mystery of Dark Matter: A Beginner's Guide
  • · Replies 4 ·
Replies
4
Views
3K
Does the Name of Mars Reflect its Ancient Oceans?
  • · Replies 9 ·
Replies
9
Views
24K
Xena officially named Eris (as of 13 Sept)
  • · Replies 9 ·
Replies
9
Views
4K
Which exoplanet was the first comfirmed discovery?
  • · Replies 2 ·
Replies
2
Views
2K
Can Distance Alone Prove Gravitational Binding?
  • · Replies 3 ·
Replies
3
Views
3K
Earth-Sun Distance Over Time: Stability & Changes Explained
  • · Replies 7 ·
Replies
7
Views
9K
Publications on the evolution of stars?
  • · Replies 1 ·
Replies
1
Views
3K
Stargazing About Parabolic Telescope Mirrors
  • · Replies 7 ·
Replies
7
Views
6K
What are Some Important Effects or Phenomena in Astrophysics?
  • · Replies 1 ·
Replies
1
Views
3K
Most Distant Black Hole Discovered: 13 Billion Light-Years Away!
  • · Replies 14 ·
Replies
14
Views
4K
Moon Perturbations: Learn Differential Gravitational Forces
  • · Replies 9 ·
Replies
9
Views
4K
Is Matter and Energy the Same Thing? Debunking Claims About Physics
  • · Replies 11 ·
Replies
11
Views
3K
Permeability of free space question
  • · Replies 3 ·
Replies
3
Views
10K
Why objects at lagrangian points 4 and 5 are stable?
  • · Replies 4 ·
Replies
4
Views
3K
Anyway, Mysterious Hole on Mars Found
  • · Replies 20 ·
Replies
20
Views
4K
How Do Black Holes Escape Their Own Event Horizon?
  • · Replies 27 ·
Replies
27
Views
6K
HII Region Temperature Structure
  • · Replies 4 ·
Replies
4
Views
4K
Black hole gravity response question
  • · Replies 1 ·
Replies
1
Views
2K
Seeing the Galilean Moons with Celestron 7x50 Binoculars
  • · Replies 3 ·
Replies
3
Views
2K
A Query on Sun and Moon Coordinate data
  • · Replies 2 ·
Replies
2
Views
3K
Are we rewriting the birth of the solar system?
  • · Replies 1 ·
Replies
1
Views
2K
What would a black hole look like?
  • · Replies 6 ·
Replies
6
Views
6K
What kind of energy is released when matter and antimatter collide?
  • · Replies 4 ·
Replies
4
Views
7K
What colors represent different stages of a star's life cycle?
  • · Replies 2 ·
Replies
2
Views
4K
Is Gliese 581d a Habitable Super-Earth?
  • · Replies 0 ·
Replies
0
Views
8K
Measuring the Distances to Stars and Galaxies
  • · Replies 4 ·
Replies
4
Views
4K