Tag: observation

61 How does the Earth move in the sky as seen from the Moon? 2014-12-01T19:15:42.050

46 Why hasn't the "9th Planet" been detected already? 2016-01-23T01:36:35.630

22 Why can't we see distant galaxies with the naked eye? 2015-01-15T11:21:33.647

19 How often do comets survive passage by the Sun? 2013-10-01T13:20:01.323

19 At what distance from Earth would our Sun be the same apparent magnitude as the next brightest star in the sky? 2013-12-04T11:53:49.823

17 Why can't we observe the Oort cloud with a telescope? 2013-09-26T18:15:26.707

16 Has Hawking Radiation Ever Been Observed? 2013-09-28T16:22:23.880

16 How long should it take for us to observationally determine if Caltech's Planet Nine is really there? 2016-01-20T18:42:58.860

15 What is the object in this photo? 2013-11-24T17:56:50.880

14 How can an amateur astronomer verify the position of near Earth objects? 2013-10-10T18:42:55.477

14 Have we ever observed a body, such as a large asteroid, "hitting" the Sun? 2016-01-07T02:51:54.960

14 What wavelength to best detect the "9th planet"? 2016-01-22T11:43:40.690

14 What is it exactly about these flares of infrared light from Sgr A* that "confirms" it is a supermassive black hole? 2018-11-02T01:05:38.313

13 Why does the moon sometimes appear giant and a orange red color near the horizon? 2013-09-26T02:16:10.907

13 How do I build a stargazing aficionado's Sun funnel to observe our nearest star safely? 2013-09-26T17:17:01.853

13 How can I safely observe a Solar Flare? 2013-10-24T21:28:56.130

13 How would I measure that I'm at a pole? 2013-11-20T14:13:38.147

13 How Would a Neutron Star Actually Appear? 2015-12-15T13:30:25.177

12 What percent of planets are in the position that they could be viewed edge-on from Earth? (and thus able to undergo transits) 2013-09-26T02:04:09.627

12 How does angular resolution of a telescope translate to its parallax precision? 2013-09-27T18:35:43.900

12 What are the current observational limits on the existence of Dyson spheres/swarms/rings? 2013-09-30T23:58:26.230

12 Is it possible to observe if there is traces of life on an exoplanet? 2013-11-05T17:01:21.747

12 How can we tell the difference between matter and antimatter by observation in space? 2015-05-21T07:59:02.457

12 How the position of this black hole known? 2017-01-02T15:50:07.260

11 How can the orbit of a Kuiper Belt Object be differentiated from the transit of a rogue planet? 2013-10-02T03:37:27.467

11 Present distances between planet. How can I find them? 2014-04-01T12:05:35.947

11 Does CIBER Experiment from Caltech suggest that there can be lots of stars which are not in any galaxy? 2015-01-06T19:07:04.600

10 What observational constraints are there in detecting the presence of volcanism on exoplanets? 2013-10-01T10:14:07.360

10 Are satellites orbiting around earth visible to the naked eye? 2014-04-21T01:30:16.963

10 Are there any galaxies which fell out of sight horizon due to cosmic expansion? 2016-03-28T13:23:57.063

10 In what parts of the world is it impossible to view the night sky due to light pollution? 2016-10-04T19:58:17.057

9 How to calculate the altitude of the Moon? 2013-12-16T15:50:15.717

9 If we were to see the Sun with our naked eyes from the Orion belt, would all planets be encompassed inside the star? Is this calculable? 2013-12-24T15:10:51.093

9 Why can you see the space station on some days but not on others? 2013-12-28T03:07:39.797

9 How was Earth's "quasi-satellite" 2016 HO3 "first spotted" and it's orbit determined? 2016-06-19T02:11:20.213

9 After Oumuamua passage, has an "urgency" telescope time request procedure been set up? 2018-11-07T08:47:42.703

8 How do astronomers find interesting events? 2014-01-04T14:20:27.647

8 How are rogue planets discovered? 2014-02-13T07:02:50.463

8 Should this photo of the sun's surface actually be white? 2016-01-06T12:50:32.087

8 Is atmospheric turbulence irrelevant for ExoPlanetary transits and radial velocity measurments? 2016-01-13T17:38:55.410

8 How far away is the nearest compact star remnant likely to be? 2016-07-23T04:36:18.520

8 Why does the cloud of Orion Nebula appear more distinct when I am not directly looking at it? 2017-08-18T13:01:19.277

8 Why the blank wedges in this very early 21 cm map of the Milky Way? (Oort et al. 1958) 2018-10-19T14:34:39.347

7 Solar Noon: meridian crossing time versus time of maximum elevation 2013-12-19T13:27:59.530

7 Can I look at the sky and find the day of the week? 2014-07-04T00:17:53.893

7 What it would look like to observe people with a different time flows? 2014-12-04T13:40:57.640

7 Is stacking welder's glasses a safe way to watch at the eclipse? 2015-03-19T09:26:42.473

7 How often are new astronomical objects (variable stars, supernovae, comets, etc) discovered by amateurs? 2015-04-12T16:07:17.423

7 Why do some artificial satellites decrease and increase in brightness multiple times? 2015-07-25T01:47:22.633

7 Could Venus or Mercury have a moon that we haven't detected? 2016-02-01T10:40:51.437

7 What is the schedule for science runs of aLIGO (and VIRGO)? 2016-02-27T09:44:48.853

7 Why haven't I seen the Moon? 2016-10-03T13:41:21.100

7 Is Mars brightest from Earth at opposition, perihelion or somewhere in between? 2018-06-13T17:41:01.773

7 Estimates for "undetectable" planets in extra-solar systems 2018-11-14T16:32:47.797

6 How to measure the altitude and azimuth of a star? 2013-12-09T18:03:21.887

6 What's the smallest scale at which dark matter has been measured? 2013-12-13T01:56:52.013

6 How did Kepler determine the orbital period of Mars? 2014-07-06T19:27:53.887

6 Are there sufficient observational data to measure non-Newtonian perihelion advances of any Asteroid and Comet orbits? 2014-09-10T12:50:49.230

6 When do Mercury/Venus reach greatest elevation at sunset/twilight for a given location? 2014-10-05T17:05:31.830

6 How would we detect a planet behind the Sun? 2014-10-09T08:47:04.467

6 What is in the brightest area of the night sky? 2015-10-26T19:19:23.590

6 What good evidence exists for the 9th planet as spoken of by Caltech? 2016-01-25T17:34:09.223

6 Why when we look through a telescope in space, do the billions of stars not block our view from seeing further? 2016-02-14T09:44:27.523

6 Radio telescope targeting 2016-04-13T09:43:05.867

6 What is the composition of the Solar Wind? 2016-09-16T19:11:02.603

6 Occultations of Triton 2017-12-15T13:58:05.913

5 How much did we know about asteroids at the beginning of the 20th century? 2013-10-28T10:24:36.300

5 Planned telescope to detect alien waste-heat 2013-11-10T09:23:14.237

5 What are some night sky objects I could see with my Celestron UpClose 20x50 Porro Binocular? 2013-12-13T15:10:55.913

5 How would Alpha Centauri A appear from the surface of Alpha Centauri Bb? 2014-05-01T16:14:12.030

5 How can we know the nature of the companion in a neutron star binary? 2014-05-18T08:17:47.933

5 How do I find the RA of sunset and sunrise in a specific location? 2014-09-11T03:51:38.653

5 Pictures of a curious astronomical phenomenon 2014-10-23T11:39:37.527

5 Have we seen a black hole? 2016-02-13T18:16:04.910

5 How Soon Could a Waxing Crescent Moon Be Seen? 2016-03-21T23:37:13.427

5 Is Planet Nine observable in principle? 2016-06-26T21:55:15.100

5 Is remote measurement of isotope ratios possible, or must a sample be aquired 2016-07-22T04:48:36.160

5 What galaxy looks the most like the Milky Way? 2017-01-23T08:06:20.813

5 Does this amateur observation hold a record even including robotic searches for supernovae? 2018-02-21T23:07:46.103

5 Why is sunset on 21st of June not the latest? 2018-07-21T03:48:28.433

4 Colossus telescope, trying to outsmart aliens? 2013-11-12T01:12:37.857

4 Open data for satellites positions 2013-11-17T18:29:44.150

4 Why do Jovian moons fade when transiting Jupiter's shadow? 2014-04-10T06:36:06.640

4 Perception of an objects history passing as an observer moves toward it 2014-07-24T07:29:52.387

4 Save current state in ds9? 2014-09-05T05:09:36.003

4 What uncertainty does an error bar signify in astronomy? 2015-02-10T17:41:08.633

4 What's the distribution curve for meteor sightings? 2015-08-16T01:17:53.327

4 Why do spectroscopic binaries have approximate circular orbits? 2015-11-25T20:22:41.827

4 What is an "arc" spectrum ? 2015-12-01T11:13:55.127

4 Why would the Earth's solar analemma would be still a figue eight even if Earth's orbit was circular? 2015-12-02T22:40:34.737

4 Calculating longitude from star culmination 2016-01-30T15:08:54.937

4 Why the light curve goes down when the planet is behind the star? 2016-06-26T14:02:29.067

4 Could non-supernova carbon, oxygen, or silicon flashes be observed? 2016-07-29T22:40:20.500

4 Equinox sunrise sunset direction 2017-03-01T16:51:05.450

4 Observation of Gravitional waves by LIGO from binary black hole merger 2017-04-11T05:45:12.440

4 What is the farthest reported distance from observer from which a solar system body has occulted a star? 2017-06-26T15:41:52.043

4 Based on the smallest number of photons that can deliver information about a star, what is the largest size of the universe? 2017-08-19T03:18:25.263

4 Altitude of Midnight Satellite? 2017-12-29T16:43:41.763

4 How do observational astronomers manage streaks and other artifacts from objects in Earth Orbit? 2018-01-27T02:12:52.240