402 Answered Questions for the topic astronomy

05/06/19

Can the average length of the day and night of a planet be different?
At one point in "Marvel's Agents of S.H.I.E.L.D.", some agents are on a planet where the day, defined as the length of time where the sun shines on the planet, occurs only once every 18 years for a... more
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05/05/19

What is the farthest planetary body or star system object we have observed using visual light?
What is the farthest object which we can get a direct Detailed visual image of using visible light which appears more than just a dot and falls into one of the following categories: - Planet -... more
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Astronomy Science

05/03/19

The moon has a weaker gravitational force than earth. Sofia weighs 50 lbs. on earth. How much will she weigh on the moon? exactly 50 lbs. less then 50 lbs. more than 50 lbs.
Plz help!!!!!!!me ineed awoj uhftureh
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Astronomy History Solar System

04/28/19

Why did the ancients fail to discover that the Earth orbits the Sun?
The ancients observed that the Sun and the 'fixed' stars rotated about the Earth. They were also aware that the Earth was spherical. They performed many astronomical measurements on the planets -... more
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Astronomy Meteors

04/28/19

Which is the strongest meteor shower expected in the next years in the Northern hemisphere?
Which is the strongest meteor shower expected in the next years in the Northern hemisphere?Is it possible to give good predictions for this?
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Astronomy Black Holes

04/28/19

Direct observations of a black hole?
I'm not very knowledgeable about physics generally, but know that nothing can escape a black hole's gravitational pull, not even light (making them nearly invisible?). My question is: **What has... more
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04/28/19

Why can I never see any stars in the night sky?
I have always lived near a large city. There is a stark contrast between the picture linked below for example, and what I see with the naked eye.Sometimes I can see a few stars here and there, but... more
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Astronomy

04/28/19

Can a planet have a larger diameter than Jupiter?
I have heard it said that if mass were added to Jupiter, then only its mass and density would increase but the diameter would stay about the same. Is this the case for Jupiter or some property of... more
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Astronomy Distance Stars Galaxies

04/28/19

How could scientists know how far a star or galaxy is from us?
How do astronomers measure how far a star (or galaxy) is away from the earth? How would they know that it has taken 13 million years for light to travel in space before it reaches us?
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04/20/19

Cameras in Voyager probes?
I've always wondered about the cameras in the space probes, especially in the Voyagers.1) What kind of cameras do they have? **Digital?** (**Electronic** - what kind of sensor and megapixel count?)... more
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Astronomy Terminology Earth

04/20/19

Does Earth have a code name?
Everything we discover in the sky get eventually a code name, like NGC 7293, Simeis 147, etc. Does Earth/Moon have a code name too? Or it is just Earth/Moon, etc.?
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04/20/19

Recommend good book(s) about the "scientific method" as it relates to astronomy/astrophysics?
I am interested in astronomy/astrophysics, but I am not science major (I am a computer science graduate). Facts and results of the field are presented to the public without showing how these... more
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Astronomy Moon

04/19/19

The Moon during the day?
Why do we see the Moon during the day only on certain days and not every day?
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04/18/19

Do we have knowledge of the geology of the moon?
With reference to the Ebb and Flow lunar satellites, was there any data about its geology? Is there a central core, or is it homogenous?
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04/12/19

How big is the universe?
Nobody knows how big the universe is, but it is mind-bending to think of just how big it might be.
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04/12/19

Why do stars flicker?
Why do stars flicker and planets don't? At least this is what I've read online and seen on the night sky. I've heard that it has to do something with the fact that stars emit light and planets... more
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04/12/19

Silicon-based life?
My question may not be suitable here, because it's more of astrobiology. Life as we know it is carbon based. 1. Is life based on silicon possible?2. What would the conditions for habitability for... more
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04/12/19

What made us think that Earth moves around the Sun?
Trying to observe the night sky for a few weeks, the motion of the Sun and the stars pretty much fits into the Geocentric Theory i.e. All of them move around the Earth.**What then, which particular... more
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04/11/19

What is the evidence for a supermassive black hole at the center of Milky Way?
Black holes cannot be seen because they do not emit visible light or any electromagnetic radiation. Then how do astronomers infer their existence? I think it's now almost established in the... more
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Astronomy

04/11/19

What to show a beginner?
At my new job, it's soon going to be my turn for doing night/graveyard shifts for a fair amount of weeks. Perfect excuse to buy a decent beginners telescope to replace the 4.5" 15 y/o Meade that... more
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Astronomy Optics Everyday Life

04/05/19

How big should a lens of a telescope be so we can see the American flag on the Moon from the Earth's surface?
How big in diameter should the lens of the imaginary telescope to be so we can see the American flag from e.g. some observatory in Hawaii?
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04/04/19

In astronomy what phenomena have theory predicted before observations?
As far as I know, astronomy is generally an observational science. We see something and then try to explain why it is happening. The one exception that I know of is black holes: first it was... more
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Astronomy Geometry Moon Sun

03/28/19

Why does the full Moon appear?
I know that the full Moon appears when Sun, Moon and Earth are in a straight line, but if we consider that they are in straight line, why is the Moon illuminated?I mean to say that Earth should... more
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Astronomy Stars Visible Light

03/27/19

Are there stars that wouldn't look white to the naked eye?
I have a small YouTube channel in which I make videos about topics relating science and things I find interesting. The topic I'm working on recently is on the color of the sun. What I thought at... more
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Astronomy Geometry Moon Sun

03/19/19

Why does the light side of the moon appear not to line up correctly with the evening sun?
I live at roughly $(52.4^\\circ,-2.1^\\circ)$. On sunny evenings I've often looked at the Moon and the Sun and noticed that the light part of the Moon does not appear to line up with the Sun. For... more
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