0
votes
0answers
4 views

Will we see gravitational waves from the big bang?

This is almost identical to an unanswered question already asked, but I want to put it a different way. The announced LIGO event was from a localized source. I assume that gravitational waves from the ...
0
votes
1answer
59 views

Is the Earth Really Spinning? (honest question)

Most people consider it common knowledge that the Sun's "movement" in the sky is only perceived due to the Earth's "spin and movement". Based on this, you'd think that the stars in the night sky ...
1
vote
1answer
38 views

Is there a single, most prominent helium line?

There's a prominent spectral line at ~1420 MHz caused by hydrogen. From what I can tell, this is the most notable electromagnetic emission from hydrogen in radio astronomy. Is there an equivalent ...
6
votes
1answer
81 views

At what size to objects burn up in the atmosphere when falling from orbit?

As the title suggests, I am wondering the maximum size an object can be so that it will completely burn up when entering and falling through earths atmosphere. I'm focusing on man made objects, not ...
1
vote
0answers
8 views

Why do Earth and moon move apart, but binary black holes move closer when both are losing energy?

According to the accepted answer on Is the moon moving further away from Earth and closer to the Sun? Why?, the moon is receding from Earth because tidal forces and friction cause energy to be lost. ...
2
votes
1answer
22 views

Does a spinning mass follow a strait trajectory in space? Or is it curved like a golf ball?

Suppose that we can send to identical satellites (like Voyager 1&2) on identical trajectories. But one spins to the right while the other spins to the left. Would they follow the same ...
6
votes
3answers
1k views

Quantum Mechanics after Gravitational Waves detection

Of course everyone knows by now the detection of Gravitational waves (http://www.iflscience.com/space/gravitational-waves-observed-first-time) But, since General Relativity and Quantum Mechanics ...
1
vote
2answers
47 views

What happened just before the Big bang?

Does the CMB contain any clues to what caused the Big Bang? Does a mathematical model theorize it?
0
votes
0answers
5 views

How the magnetic field and the rotation of the planets and the sun inside our planetry system are related

Coming from this question Are there collected data about the direction of rotation of black holes and the direction of the magnetic field? I want to know: How the magnetic field and the rotation of ...
-1
votes
0answers
18 views

Data analysis projects fora newly renovated desktop? [migrated]

I just renovated a desktop that had been in storage for a while, and I'd like to come up with some big data analysis projects to run on it in the background. Does anyone have any ideas, know of any ...
0
votes
0answers
8 views

Relationship between absolute magnitude of a star and its luminosity?

Why does this relationship involves the absolute magnitude of the sun and its luminosity? How to derive an expression relating the absolute magnitude of a star to its luminosity? So according to ...
1
vote
1answer
23 views

Gravitational wave detection time difference between LIGO Livingston and LIGO Hanford

Quote from LIGO's news release: By looking at the time of arrival of the signals—the detector in Livingston recorded the event 7 milliseconds before the detector in Hanford—scientists can say ...
0
votes
2answers
56 views

Can black holes collide with the Sun? In that case what will happen?

Can a black hole collide with the Sun? What will happen in that case? Will the Sun survive?
4
votes
3answers
86 views

Why is the detection of gravitational waves such a “Big” deal?

I'm a non-scientist. Today's announcement of LIGO's detection of GW waves has been heralded as "huge" –on the same level as the Higgs Boson detection. I realize this is the last remaining part of ...
0
votes
1answer
43 views

When stars explode why can we still see them?

This might be a silly question but if light travels at the speed of light and time is frozen in that speed then why the stars we see could be dead already and not just instantly disappearing from the ...
2
votes
3answers
211 views

Meaningful theories of the shape of the universe

Normally, when people say "the universe is infinite" they generally mean something like "the observable universe is locally flat, it is easy to assume that it is flat way beyond the observable ...
1
vote
1answer
22 views

Measuring time and distance in space

When reading through articles about discovering gravitational waves, I got basic understanding of events that happened. But one thing wasn't clear for me. They say that two black holes collided 1.3 ...
2
votes
0answers
19 views

Spinning black hole vs non spinning black hole

Does a spinning black hole have a stronger gravity than a non spinning one.After all, a spinning black hole is stretching space-time more, so does that make a difference is gravity?
2
votes
1answer
45 views

Can a black hole rip spacetime

Can a black hole which has an enormous mass and spins so fast cause spacetime to to be stretched to is absolute limits that it start so rip?
1
vote
1answer
14 views

How to compensate the effect of tectonic activity in devices like LIGO?

In late 2015, the LIGO project team announced the detection of gravitational waves. The detector is (very basically) a laser measuring the distance between two mirrors in vacuum, over a large-enough ...
0
votes
1answer
29 views

Is it possible to get a glimpse of the Big Bang through gravitation waves?

I read in an article announcing the detection of gravitational waves by LIGO that it will be possible to detect them from the Big Bang. Is this true?
1
vote
1answer
136 views

What do gravitational waves allow us to understand?

Before reading this question, you should read this paper. From what I understood, we managed to detect gravitational waves for the first time. Is this discovery going to help us understand ...
1
vote
2answers
98 views

Calculate time when star is above altitude 30°

To find the best observation time for an object, I'd like to calculate the time when it is 30° or more above the horizon. Local Sideral Time would be sufficient. To include that in my program, I need ...
3
votes
2answers
97 views

Why is it said that the far side of the moon's crust is thicker?

This video states that NASA has determined that the far side of the moon's crust is thicker than the near side's crust. How did they determine this? Please note I'm not asking for theories or ...
1
vote
0answers
40 views

The black hole binary that was detected by advanced LIGO - how do such hypergiant binaries form?

With today's announcement of the historic detection of gravitational waves from the merger of 36 solar mass and 29 solar mass black holes 1.3 billion light years away, one can not help but wonder how ...
0
votes
1answer
32 views

Determining distance from semi-major axis and eccentricity

I am trying to obtain the distance covered by an object in orbit around the earth within a specified amount of time past its perigee passage. The object is in an elliptical orbit with eccentricity 0.2 ...
0
votes
0answers
26 views

Are there other universes? [duplicate]

Our universe is a very unlikely place. Alter some of its settings even slightly and life as we know it becomes impossible. In an attempt to unravel this "fine-tuning" problem, physicists are ...
0
votes
0answers
15 views

Bright lines in a continuum spectrum

Dark lines in a continuum spectrum is common. But are there bright lines too? By the stimulated emission process, the light can also be amplified, right? In this case, we should get bright lines ...
1
vote
2answers
38 views

Where can I watch the announcement from LIGO about gravitational waves?

Today the LIGO consortium are having a press conference to update us on their search for gravitational waves. How should I watch the announcement?
-2
votes
0answers
58 views

energy can neither be created nor destroyed [on hold]

I've studied that energy cannot be destroyed,but when light is absorbed by black hole then it is destroyed because there is a theory that when light enters the black hole,some times it may transported ...
0
votes
1answer
52 views

Multiple aerobraking [on hold]

I moved this question to more related : Space exploration I spent a lot hours with Kerbal Space Program recently and I am courious about one thing. I got into orbit of moon and then I was able to ...
1
vote
1answer
16 views

What Are Some Good Southern Hemisphere 7x50 Binocular Targets?

I've been interested in astronomy for a while but only recently purchased my first set of binoculars (7x50). I've been learning various constellations as well as spotting some other objects with the ...
3
votes
1answer
316 views

Where do new stars get their hydrogen from? [duplicate]

When stars run out of hydrogen, they explode (though they also use heavier elements for some time) and form nebulae. In the nebulae, new stars are born which use hydrogen as their fuel. So, my ...
1
vote
2answers
30 views

Is the colour of a wave from a far galaxy the same for us as for a galaxy which lies between?

Because of the expansion of the universe, light from a far galaxy is redshifted. The expansion of the universe will make the wavelength of light longer. But is the colour of such light the same for ...
3
votes
2answers
62 views

Why do planets move in an elliptical orbit?

I am a student of class 9 and recently came to know about kepler's law of planetary motion and got confused about the foci and elliptical orbits of planets and some stars.
4
votes
1answer
52 views

What is driving the expansion of the Universe?

Is it just the momentum from the Big Bang? If yes, how can it account for the acceleration of the expansion? Why isn't the collective gravitational force slowing it down? What part does dark energy ...
1
vote
1answer
19 views

Does earth's Umbra reach Sun-Earth L2?

Moon can be fully eclipsed by the virtue of being fairly close to Earth. Any body distant enough will not be eclipsed fully, Earth's disc not fully covering Sun's disc. How's that for anything at the ...
7
votes
2answers
64 views

What conditions would lead to this event around the black hole in the Pictor A galaxy?

This is a picture of a jet of particles exiting the supermassive black hole in the center of Pictor A galaxy at nearly the speed of light. Source This event is supposedly created from a black hole ...
4
votes
1answer
50 views

Why do pre-main sequence stars show lithium in absorption?

This paper and this paper state without discussion that the presence of lithium absorption in the stars they observe as strong evidence of these stars being pre-main sequence stars. Because they state ...
13
votes
2answers
4k views

Is the moon moving further away from Earth and closer to the Sun? Why?

According to The NASA Moon Facts page: The moon is actually moving away from earth at a rate of 1.5 inches per year. Why is the moon moving further away from the Earth? Is this a result of the ...
5
votes
3answers
858 views

Gallery of 'actual images' from space?

Where can a gallery of actual unaltered photographic images taken in (or of) space be found? Specifically ones that are untouched, not colorized (not necessarily black and white, but they usually ...
1
vote
2answers
40 views

Are any other planetary bodies warming up as well in the Solar System?

Do we have a few decades worth of surface temperature data to compare?
0
votes
0answers
32 views

How does the electric universe theory see the repelling forces happening in universe?

The Electric Universe Theory (EUT) explains why gravitational forces aren't real and not needed because these forces can also be explained by electromagnetic forces. But using these electromagnetic ...
6
votes
1answer
373 views

How do star densities work?

If we take a look at stars more massive than the Sun, their densities vary a lot. UY Scuti is an extremely low-density star that's only 8.5x more massive than the Sun, but is 1000-2000x its size. ...
1
vote
0answers
24 views

What would we not know without spectroscopy?

What do we depend on spectroscopy to know about in astrophysics? Or, without spectroscopy, what would remain unknown to us? I want to know how important it is. My wife is studying spectroscopy in ...
0
votes
0answers
6 views

Convert axis display in ds9

I have a fits file of an echellogram with the axes showing the pixel indices. However, I would like to convert my horizontal axis from pixel to wavelength given that I have a conversion formula for ...
6
votes
1answer
198 views

What is the bluest narrow band filter mounted on ground based telescopes?

If we want to check a QSO's lyman alpha narrow band image, could a ground based telescope do that? I mean under the circumstance that its lyman alpha shifts to 3300A.
22
votes
2answers
4k views

Why does Jupiter have so many moons?

Jupiter has a great many moons - in the hundreds, and they're still being discovered. What is the current theory for where all these moons came from? Are they rocks flying through space captured by ...
0
votes
1answer
32 views

Eclipse — Solar and Lunar

Q. Why is solar and lunar eclipse not seen from all parts of the earth at the same time? I think its because of the revolution of the earth but i am not sure. I want a more reliable answer.
1
vote
1answer
34 views

Is it ever possible that the graviation from the mass of kinetic rotational energy will overcome centrifugal force?

This is, I think, somewhat intuitively obvious, but this comment got me thinking about this: what is gravitational force? "Rotation speed can create centrifugal force opposing gravity and making ...

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