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 Composition of the Sun: How We Know via Spectral Absorption Lines
  • · Replies 10 ·
Replies
10
Views
3K
Undergrad Can Relativity Be Confirmed Again with a Star and a Black Hole?
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad Neptune images from VLT better than Hubble
  • · Replies 3 ·
Replies
3
Views
2K
High School Saturn's Rings Appearance from Saturn?
  • · Replies 6 ·
Replies
6
Views
2K
High School Attention: We have an important announcement from our Sun
  • · Replies 4 ·
Replies
4
Views
2K
High School General theory of relativity&Planet orbits
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Liquid water reservoir reported under Mars polar cap
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Which Main Sequence Stars Experience Hot Corona Phenomena Beyond G2?
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Thoughts on Breakthrough Starshot?
  • · Replies 22 ·
Replies
22
Views
4K
High School Discussing Sterile Neutrino Candidacy as Dark Matter
  • · Replies 56 ·
2
Replies
56
Views
8K
Graduate Do any coordinate systems include self magnification?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Why is the Moon getting further from Earth ?
  • · Replies 5 ·
Replies
5
Views
2K
Stargazing Help with how to start Stargazing
  • · Replies 30 ·
2
Replies
30
Views
5K
Undergrad How do telescopes allow us to see light sources millions of light years away?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Spherical Symmetry/Simultaneity of Supernova Explosions
  • · Replies 8 ·
Replies
8
Views
2K
High School NYTimes: 79 Moons of Jupiter and Counting
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Redshift and the Friedmann metric
  • · Replies 9 ·
Replies
9
Views
3K
High School Blazar as the Source of Cosmic Neutrinos Confirmed
  • · Replies 8 ·
Replies
8
Views
3K
Undergrad White dwarf collapses into a neutron star and Energy is released
  • · Replies 9 ·
Replies
9
Views
4K
High School Known properties and constraints of dark matter
  • · Replies 11 ·
Replies
11
Views
3K
Undergrad Chemical Elements produced inside the Sun
  • · Replies 65 ·
3
Replies
65
Views
8K
High School The Stefan-Boltzmann Law and Sunspots
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Convincing a Flat Earther: Proving the Earth is Spherical
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Space elevator and Coriolis force
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad Mass Equivalence of Photon Content Inside the Sun?
  • · Replies 12 ·
Replies
12
Views
2K
High School What is the gravitational force like near a black hole?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Image of a Newly Formed Planet in a Disk Around a Star
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Particle acceleration and kinetic energy
  • · Replies 1 ·
Replies
1
Views
1K
Stargazing Achieving Better Astrophotography at Home
  • · Replies 39 ·
2
Replies
39
Views
6K
Undergrad About gravitational binding energy and kinetic energy
  • · Replies 11 ·
Replies
11
Views
4K
Obituary of Constance Adams, Space Habitat Designer
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Is the Milky Way's halo curved spacetime?
  • · Replies 1 ·
Replies
1
Views
1K
High School Why do most of the celestial bodies rotate about their axis?
  • · Replies 10 ·
Replies
10
Views
4K
High School Equivalent gravitational forces in other galaxies
  • · Replies 3 ·
Replies
3
Views
2K
High School Oumuamua non-gravitational acceleration
  • · Replies 1 ·
Replies
1
Views
2K
High School Lowest possible altitude for a Satellite
  • · Replies 32 ·
2
Replies
32
Views
5K
High School Please explain to me the 2d holographic universe
  • · Replies 3 ·
Replies
3
Views
2K
High School What is the role of a non-real observer in mathematical thinking?
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad How on Earth This is possible? (distance to a far galaxy)
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad How stellar aberration was quantified in the early days
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad How do we get stars so much more massive than the Sun?
  • · Replies 16 ·
Replies
16
Views
6K
High School History question -- The choice of the North Pole being up or down
  • · Replies 18 ·
Replies
18
Views
2K
High School What Makes Red Dwarf Stars Cooler Than the Sun?
  • · Replies 44 ·
2
Replies
44
Views
8K
Undergrad Manned mission to Europa: science or still scifi?
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad How Does Angular Diameter Distance Apply to the Last Scattering Surface?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad 2 second delay at the merger of two neutron stars in August 2017
  • · Replies 4 ·
Replies
4
Views
2K
Stargazing A good telescope with tracking for deep sky objects
  • · Replies 17 ·
Replies
17
Views
4K
High School What is the Speed of Light in Dark Matter?
  • · Replies 29 ·
Replies
29
Views
6K
Graduate Methane and Organic Molecules on Mars
  • · Replies 18 ·
Replies
18
Views
4K
Undergrad Does the barycenter of the Earth-Moon system change?
  • · Replies 2 ·
Replies
2
Views
2K
Stargazing Could the 1841 Meteor in Puget Sound Be Something Else?
  • · Replies 17 ·
Replies
17
Views
3K
High School Is space is continuous or discrete?
  • · Replies 10 ·
Replies
10
Views
2K
High School What is the speed of the Earth traveling through the cosmos?
  • · Replies 11 ·
Replies
11
Views
3K
Stargazing How is noise removed in radio telescopes?
  • · Replies 28 ·
Replies
28
Views
7K
Undergrad Question about the Na-O anti correlation
  • · Replies 1 ·
Replies
1
Views
2K
High School Would planets fall out of orbit when gravity has a speed?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad What to do with unused space in a home freezer?
  • · Replies 20 ·
Replies
20
Views
6K
Stargazing What makes the Thirty Meter Telescope a game-changer for astronomy?
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Did NASA's Curiosity Rover Discover Ancient Organic Matter on Mars?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad How many degrees / radians is one full orbit of the Earth?
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad What does L star mean in the Schechter function?
  • · Replies 3 ·
Replies
3
Views
4K
Undergrad Are displaced dark matter and curved spacetime same thing?
  • · Replies 12 ·
Replies
12
Views
2K
Stargazing Spotting the ISS With My Binoculars: A Lucky Moment
  • · Replies 10 ·
Replies
10
Views
3K
Undergrad Why Is the Velocity of an Oort Cloud Object Approximately Zero?
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad How to check if stellar/galactic spectrum extraction went well?
  • · Replies 3 ·
Replies
3
Views
3K
High School Is there a way to measure gravity in a particular area of space
  • · Replies 14 ·
Replies
14
Views
3K
High School LIGO's Detection of Gravitational Waves: BH-BH & BH-NS Mergers
  • · Replies 6 ·
Replies
6
Views
4K
High School Calculating Weight and mass of entire black hole
  • · Replies 11 ·
Replies
11
Views
5K
High School Spectroscopy of Stars: Electrons in Plasma
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad How is color added to Hubble images?
  • · Replies 7 ·
Replies
7
Views
4K
Undergrad Understanding 2012 VP113's Perihelion and Its Significance in Planetary Origins
  • · Replies 1 ·
Replies
1
Views
2K
High School Could a Black Hole Cause a Sunrise in the West?
  • · Replies 34 ·
2
Replies
34
Views
6K
Undergrad Did astronomers just lengthen the expected life of the Sun by 5 Gy?
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Does a Quasar Have Proper Motion?
  • · Replies 22 ·
Replies
22
Views
5K
Undergrad Perceived Speed of Objects in Space
  • · Replies 5 ·
Replies
5
Views
2K
Stargazing What Causes the NEQ6 Pro Mount to Have 'Brain Failure' During Alignment?
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad V774104: Mysterious Sednoid with No Known Orbit
  • · Replies 8 ·
Replies
8
Views
4K
Undergrad Andromeda and the cosmological redshift
  • · Replies 28 ·
Replies
28
Views
5K
Stargazing Where did oxygen come from? Stars or something else?
  • · Replies 21 ·
Replies
21
Views
4K
Undergrad Relationship between stellar mass and core mass?
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad Frequency of nearby Supernova Explosions
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad Atmospheric CO2 and diurnal Asymmetry
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad How can I go about making a "Space Proof" coating?
  • · Replies 3 ·
Replies
3
Views
2K
High School Did Astronomers Really Think the Milky Way Was the Only Galaxy in 1900?
  • · Replies 8 ·
Replies
8
Views
3K
Undergrad On gravity and the conservation of energy
  • · Replies 30 ·
2
Replies
30
Views
5K
Stargazing Zeiss Terra ED 10x42 Binos for stargazing?
  • · Replies 8 ·
Replies
8
Views
4K
Graduate What are the typical uncertainties of data in Astophysics?
  • · Replies 7 ·
Replies
7
Views
3K
High School Gravitational difference between a black hole and a star
  • · Replies 3 ·
Replies
3
Views
2K
High School The Search for a Neutron Star or Black Hole Nearby
  • · Replies 13 ·
Replies
13
Views
3K
Undergrad Gravitational difference between a black hole and a star
  • · Replies 30 ·
2
Replies
30
Views
5K
Undergrad Are Stars and Planets Differentiated by Nuclear Processes in the Solar System?
  • · Replies 10 ·
Replies
10
Views
4K
Undergrad Is there a plan for a search for nearby black holes?
  • · Replies 55 ·
2
Replies
55
Views
8K
Graduate Sufficient conditions for Rayleigh-Taylor instability
  • · Replies 1 ·
Replies
1
Views
2K
Stargazing Geomagnetic Storming: High Latitude Regions Alerted 15-18 Feb
  • · Replies 21 ·
Replies
21
Views
4K
Undergrad Is Jupiter Responsible for the Majority of the Solar System's Angular Momentum?
  • · Replies 24 ·
Replies
24
Views
3K
High School How do scientists measure mass, radius, and distance in astronomy?
  • · Replies 5 ·
Replies
5
Views
2K
High School Traveling to Mars and time dilation
  • · Replies 4 ·
Replies
4
Views
6K
Undergrad Colonies on Mars -- fundamental problem
  • · Replies 47 ·
2
Replies
47
Views
6K
Undergrad Origin of the Moon: Latest Discoveries and Theories
  • · Replies 20 ·
Replies
20
Views
3K
High School Colliding black holes effect on the Richter scale
  • · Replies 16 ·
Replies
16
Views
2K