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.
Undergrad This Wikipedia article about Scholz's Star doesn't make sense
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Asteroid Response Help: Get Answers to Your Questions Here
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad What is the current understanding of supernova mechanisms in 2020?
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad Why does the Universe have so many galaxies?
  • · Replies 20 ·
Replies
20
Views
4K
Undergrad Tidal forces acting on planet NGTS-10b
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Does the expansion of the Universe heat stars and bodies?
  • · Replies 13 ·
Replies
13
Views
3K
Undergrad Astronomers detect biggest explosion in the history of the Universe
  • · Replies 15 ·
Replies
15
Views
3K
Undergrad Ptolemaic Model of the Solar System
  • · Replies 12 ·
Replies
12
Views
6K
Undergrad Is there a distinction between angular resolution and angular discrimination?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad LIGO+Virgo saw something unknown
  • · Replies 15 ·
Replies
15
Views
5K
Undergrad Is there an experimental proof that an Earth/Moon barycenter exists?
  • · Replies 51 ·
2
Replies
51
Views
7K
Undergrad Earth-centered frame with Earth-Sun line fixed
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Questions about the expansion of space on galactic scales
  • · Replies 13 ·
Replies
13
Views
3K
Undergrad Viewing Planets or stars from a high altitude
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad The solar system and the Coriolis effect
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad How to calculate the wavelength of light coming from 1 light year away
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Is Dark Matter's Gravitational Force Weaker Than Visible Matter's?
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Are there upper and lower limits to the inverse square law?
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad Finding the Sun's Angle from Longitude, Latitude & Time/Date
  • · Replies 9 ·
Replies
9
Views
3K
Undergrad What causes the mysterious eclipses in Epsilon Aurigae?
  • · Replies 27 ·
Replies
27
Views
6K
Undergrad Help with the color of a star cluster
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Why do dark matter and baryon matter have different distributions?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Does gravity act differently on a Solar System, a Galasy, and the Universe?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Questions on Galactic Coordinate Systems
  • · Replies 8 ·
Replies
8
Views
3K
Undergrad Can Flat Rotation Curves in Spiral Galaxies Be Explained by Dynamical Friction?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Visibility of celestial bodies during the daytime
  • · Replies 22 ·
Replies
22
Views
3K
Undergrad Determining Degenerate Gas in Stellar Structure
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Is This Newly Discovered Black Hole Breaking The Rules of Stellar-Mass Limit?
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Absorption lines and emission lines in stellar spectra
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Help with the Virial Theorem please
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad True length of sidereal year in 6000 b.c.e.
  • · Replies 28 ·
Replies
28
Views
6K
Undergrad First results from Parker Solar Probe on Wednesday (18:30 pm UTC)
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Building a solar system simulator
  • · Replies 15 ·
Replies
15
Views
3K
Undergrad Inside The 24/7 Search For Another Habitable Planet Within 100 Ly
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad Does Dark matter get trapped in black holes and increase their mass?
  • · Replies 14 ·
Replies
14
Views
3K
Undergrad Which instruments are used to determine the composition of dark matter?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad The Supergalactic plane and a coordinate system
  • · Replies 15 ·
Replies
15
Views
6K
Undergrad Dark Matter Mass: Evidence of Low-Mass?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad How Far Can the Square Kilometre Array 'Listen' for Extraterrestrial Signals?
  • · Replies 22 ·
Replies
22
Views
3K
Undergrad Neutron Star Core: Empty Obloid Cavity & Exotic Content?
  • · Replies 9 ·
Replies
9
Views
3K
Undergrad Help With Simple Orbital Modeling
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Can S5-HVS1 Retain Its Planets?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Angular Momentum in a Solar Nebula
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad What is the new source of space radiation discovered near Earth?
  • · Replies 46 ·
2
Replies
46
Views
11K
Undergrad Where does gravity switch from stronger to weaker, if it does?
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad Interpreting a scale factor vs. distance graph
  • · Replies 13 ·
Replies
13
Views
4K
Undergrad Separating Masses in Kepler's Third Law
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Confusion over what exactly constitutes the ecliptic
  • · Replies 3 ·
Replies
3
Views
4K
Undergrad Mass-luminosity relationship for red giants and AGB stars?
  • · Replies 1 ·
Replies
1
Views
3K
Undergrad Question about Galactic Rotation curves in the Milky Way galaxy
  • · Replies 14 ·
Replies
14
Views
4K
Undergrad Calculating Speed and Acceleration of a Gas Blob Orbiting a Massive Black Hole
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Would a rover on an asteroid float away because of the low gravity?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad How is asteroid 101955 Bennu possible?
  • · Replies 8 ·
Replies
8
Views
3K
Undergrad What happens to gravitational waves?
  • · Replies 28 ·
Replies
28
Views
5K
Undergrad Travel from Mars to Earth question......
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad Heating/cooling moon tunnels, why and how?
  • · Replies 16 ·
Replies
16
Views
3K
Undergrad Matter-Antimatter black hole collision
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Are the red dots in the Whirlpool Galaxy individual red supergiants?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad How to Assign Initial Conditions for Binary Star Systems in a Simulation?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad How Does Kirchoff's Law Relate to Spectrum Intensity and Wavelength?
  • · Replies 8 ·
Replies
8
Views
3K
Undergrad Is Planet 9 Actually a Primordial Black Hole?
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad How can Kepler's laws be visualized using a simulator?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad NASA's Black Hole Visualization/Explanation
  • · Replies 13 ·
Replies
13
Views
5K
Undergrad Is J0740+6620 an eclipsing system?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Electricity & Planetary Magnetic Field Reversal: Implications & Studies
  • · Replies 20 ·
Replies
20
Views
4K
Undergrad Could a Star Avoid a Supernova and Form a Black Hole?
  • · Replies 43 ·
2
Replies
43
Views
10K
Undergrad Challenges to the Redshift Method and Hubble's Law
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Large Bipolar radio bubbles in the Galactic Centre
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Question about stellar nucleosynthesis from a non-expert
  • · Replies 8 ·
Replies
8
Views
3K
Undergrad Were paths of Voyager craft lucky to get out of the heliosphere?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Europa Clipper Interplanetary Mission
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Relationship between collision and relaxation
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Distance using Cepheid variables
  • · Replies 8 ·
Replies
8
Views
3K
Undergrad Is there a radial gradient of redshifts within individual galaxies?
  • · Replies 10 ·
Replies
10
Views
3K
Undergrad Why are planets visible in a telescope in the daylight?
  • · Replies 9 ·
Replies
9
Views
3K
Undergrad Deflect Asteroid w/ Collisions: Calculating Theta & MJ Interractions
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad The Symmetry of Angular Momentum Conservation
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad Did Planet 9 and Neptune Cause Uranus' Tilt?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad What is Earth's future warming due to the Sun's increasing luminosity?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad On Hubble's constant, the expansion of the Universe and vacuum energy
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad How much worse is the location of La Palma vs. Mauna Kea?
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad What is the Maximal Parallel Velocity of a Satellite in an Elliptical Orbit?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Free Orbit Insertion: Is it Possible?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Are dark matter and dark energy caused by same phenomenon?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad E- & Ions Deflection by Earth's Magnetic Field
  • · Replies 30 ·
2
Replies
30
Views
6K
Undergrad Earth’s Magnetic field formula or downloadable vector field
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad Fraction of solar systems with an Earth-moon configuration?
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad New table-top gravitational-wave detector proposed
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Is the Solar Constant Really 340 W/m^2 or 680 W/m^2?
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad Can Satellites in Frozen Orbits of the Moon Study Different Ground Areas?
  • · Replies 14 ·
Replies
14
Views
4K
Undergrad What is the geometric plan for ALMA?
  • · Replies 19 ·
Replies
19
Views
3K
Undergrad Can the LIGO observatories detect (with accuracy) temblors?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad The laws of thermodynamics and the Universe
  • · Replies 16 ·
Replies
16
Views
4K
Undergrad How can an asteroid get caught at a Lagrange point without a "brake"?
  • · Replies 44 ·
2
Replies
44
Views
8K
Undergrad Does the gravity sling require rocket guidance to be non-negligible?
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad How was the Earth's Orbit Derived?
  • · Replies 1 ·
Replies
1
Views
3K
Undergrad SpaceX's 5K Satellites: A Risk of Man-Made Meteors?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad My 3rd question - About Stellar Spectrum
  • · Replies 2 ·
Replies
2
Views
4K
Undergrad BREAKING: New potentially habitable exoplanet found around Teegarden
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad What's the largest rocky planet with 1g gravity in theory?
  • · Replies 15 ·
Replies
15
Views
5K