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.
Calculating the size of planets from length of days.
Replies
4
Views
5K
Is the Expanding Universe Slowing Down According to Age?
Replies
4
Views
3K
Is Faster-Than-Light Space Travel Possible with New Technology?
Replies
18
Views
6K
Are Asteroids Outside Our Solar System and the Moon Affected by Impact Tsunamis?
Replies
6
Views
3K
Light approaching the event horizon
Replies
5
Views
3K
Do Galaxies Move? Rotation Around Something?
Replies
5
Views
5K
What are the consequences of pole reversals on Earth
Replies
9
Views
6K
Satellite's Tidal Force & Orientation: Can It Affect Interlock?
Replies
4
Views
3K
Baby Universes? - Leonard Susskind's Hyperspace Theory
Replies
1
Views
2K
Why the plane of the rings is vertical to the rotation axis of Saturn?
Replies
11
Views
7K
Understanding Time in Physics: Questioning the Effects of Gravity on Black Holes
Replies
20
Views
5K
Can a collapsing star only form a black hole if it has a companion?
Replies
7
Views
4K
Thinking Outside of Space: Big Bang Theory and Beyond
Replies
9
Views
4K
What Happens When You Increase an Extremal Black Hole's Charge?
Replies
5
Views
2K
If we have two parallel plane in the space in addition to another two
Replies
2
Views
2K
Elliptic orbit of earth round the sun
Replies
1
Views
4K
Need VERY recent paper in observational astronomy for journal club presentation
Replies
1
Views
3K
Black holes and Event Horizon: Q's ?
Replies
16
Views
7K
Planets in Deep Space: Can They Escape Orbit?
Replies
15
Views
5K
What Happens at a Black Hole Singularity?
Replies
2
Views
3K
Stargazing What type of binoculars are best for stargazing in a light-polluted area?
Replies
5
Views
3K
What Would You See at the Threshold of the Expanding Universe?
Replies
15
Views
3K
Molecular Cloud Clumping Question
Replies
6
Views
4K
[QUESTION]Dark energy could it be an explosion?
Replies
5
Views
3K
[Question] What would happen if gravity were removed?
Replies
28
Views
8K
Argument against the existence of black holes?
Replies
17
Views
8K
Will the Moon's Recession from Earth Ever Cease?
Replies
1
Views
2K
What does tidal gravity feel like?
Replies
11
Views
4K
Float & Fly Freely: Differentiating Space & Earth
Replies
1
Views
2K
Planet positions and gravitational effects
Replies
3
Views
2K
Is Time Truly the Fourth Dimension in Spacetime?
Replies
20
Views
8K
Gravitational Red Shift at the center of a mass
Replies
1
Views
2K
Primordial Black Hole as nucleus for gravitic atom
Replies
11
Views
4K
Are Hot Jupiters in Stable Orbital Resonance?
Replies
4
Views
3K
Unraveling the Mystery of the Sun's Composition and the Fate of Matter Within
Replies
4
Views
2K
How Much Potassium Nitrate is Needed to Propel a 10 kg Rocket into Orbit?
Replies
3
Views
2K
Can We See All Galaxies in the Universe?
Replies
17
Views
5K
Good wallpaper pics of our red sun from earth
Replies
7
Views
5K
Question about the color of galaxies & nebulae
Replies
19
Views
10K
Determine body properties by visual spectrum?
Replies
4
Views
3K
Stargazing Muon Telescope: The Universe's Secrets
Replies
4
Views
3K
The orbital eccentricity change of the Earth ?
Replies
5
Views
3K
Learning Basics of Stellar Modelling
Replies
8
Views
4K
Could Vacuum Energy Be the Key to Understanding Dark Energy?
2
Replies
75
Views
16K
Who's the Top Expert in Black Hole & Time Travel Theories?
Replies
10
Views
9K
I need someone who knows what nebulae look like well to look at these
Replies
3
Views
3K
Intrinsic Redshift: Current Status and Research
Replies
9
Views
5K
Habitable exoplanets of white dwarfs
Replies
5
Views
4K
Lone wolf planets able to support subglacial ocean life?
Replies
18
Views
6K
Low mass post-main-sequence on HR diagram
Replies
6
Views
3K
A problem from Binney and Tremaine
Replies
2
Views
3K
Galactic angular velocity of interstellar cloud
Replies
1
Views
3K
Why do comets tails come out of the front and curve around to the back?
Replies
2
Views
4K
Novice Astrophotographer Discovers Supernova
Replies
17
Views
5K
Laser pointer for start viewing: something affordable?
Replies
13
Views
5K
Were the First Stars in the Universe Fast Spinners?
Replies
2
Views
2K
How can you discover new things in Astronomy without a PhD ?
Replies
8
Views
4K
How to Calculate the Heat Received by Newly Discovered Extrasolar Planets?
Replies
1
Views
3K
Acceleration in elliptical orbits ?
Replies
3
Views
5K
Looking for reading material on extrasolar planet detection
Replies
3
Views
3K
Does moving at high speeds actually slow down time?
Replies
8
Views
7K
Meteor radiant angle. Is this computation right?
Replies
6
Views
4K
Intro and a Question About Ellipticity
Replies
3
Views
3K
What Should Be Discussed in a Report on Core Collapse of Massive Stars?
Replies
5
Views
4K
Space Debris Removal: Where to Publish Idea?
Replies
10
Views
4K
Help with trying to spot the ISS
Replies
9
Views
4K
Does Traveling Through a Wormhole Violate the Law of Conservation of Mass?
Replies
2
Views
3K
Star variable relations. In need of further insight
Replies
10
Views
3K
Stargazing Huge difference between a 6 dobsonian and a 10 ?
Replies
2
Views
1K
Is the Old Model of the Universe Still Valid?
Replies
10
Views
4K
Help with Modeling Solar Wobble for Pre-Calc Project
Replies
8
Views
4K
Stargazing Why can this telescope only focus on very near objects?
Replies
5
Views
4K
Where's the energy go for planets axis inclined from orbital plane?
Replies
7
Views
4K
Can Galaxies Have Two Nuclei Without Merging?
Replies
2
Views
3K
Odds of Finding Alien Life: An Exploration
2
Replies
78
Views
17K
Unraveling the Mystery of Dark Matter and Its Relationship with Black Holes
Replies
5
Views
2K
Does dark matter fall into a black hole, and create radiation
Replies
13
Views
5K
How Much Longer Does an Atomic Clock Run on the Moon Compared to Earth?
Replies
3
Views
4K
Could a bullet shot from a spaceship orbiting Earth escape the planet?
Replies
9
Views
5K
Why Do Physicists Consider Black Holes Something?
Replies
7
Views
3K
Are the Wonders of the Universe waiting to be discovered?
Replies
1
Views
3K
Can a 1kg Black Hole Be Manipulated and Moved?
Replies
5
Views
6K
Does Time have a mathematical equation or Law?
Replies
9
Views
6K
Space Junk Removal: Is Laser Technology the Answer?
Replies
3
Views
2K
Are Stars Limited to Galaxies or Can They Exist in Intergalactic Space?
Replies
8
Views
6K
What can I do if I study astrophysics?
Replies
4
Views
4K
Stargazing What's a good, affordable telescope for someone who's never owned one
Replies
8
Views
3K
How Does the Angle of Impact Affect the Depth of Meteorite Craters?
Replies
5
Views
5K
How is it possible the universe is infinite?
Replies
13
Views
3K
Can anyone please suggest me a project topic?
Replies
6
Views
4K
Objects as L3 and L4 at once - possible?
Replies
7
Views
3K
Is life on other planets limited by the elements present?
Replies
11
Views
3K
What Are the Dangers of Space Travel?
Replies
9
Views
4K
Its crazy to think its all actually out there
Replies
25
Views
6K
Darkness-Free Day: A Sign of Jesus's Birth?
Replies
30
Views
8K
Physics Projects for Teenagers - Charles's Quest
Replies
5
Views
2K
What is the Definition of the Wave Zone in Potential Calculations?
Replies
2
Views
4K
Easter dating spreadsheet for Excel/OpenOffice
Replies
1
Views
3K
Required mass for hydrogen burning in stars
Replies
4
Views
2K
Stargazing Telescope Limitations: What to Know
Replies
8
Views
8K