05/13/19

What methods can astronomers use to find a black hole?
How can astronomers say, we know there are black holes at the centre of each galaxy?What methods of indirect detection are there to know where and how big a black hole is?
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05/13/19

What is the most distant object from the Earth that a spacecraft has visited to date?
What is the most distant object from the earth that a spacecraft visited has visited so far? What was the mission and when did it happen?
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05/13/19

Is it possible to see satellites with the naked eye?
Every now and then I notice some very bright "stars" in the sky. They tend to be very few (one or two, usually), and are quite much brighter than any other star out there. Often they're perfectly... more
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05/12/19

How would we see a near-lightspeed object emitting light?
Consider an object travelling near the speed of light relative to us (let it be a spaceship or a star), which is emitting light (consider it monochromatic resulting from a two level electronic... more
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05/12/19

Is the moon a planet?
Can our moon qualify as a planet? With regard or without regard to the exact definition of the planet, can the moon be considered as planet as Mercury, Venus and Earth etc. not as the satellite of... more
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05/12/19

i want to teach chemistry. how do i start off? i am from india, west bengal. i want to know my zip code.

i want to teach chemistry. i dont know my zip code. i am from india. west bengal. please help me.
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05/12/19

What do continents "lay" on?
It's a simple question.. What do continents "lay" on? Do they float on water? or are they huge bodies that "emerge" from the sea floor/bed? are they connected to the bottom of the oceans? Hope the... more
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05/11/19

Why are binary objects so critical to astronomy?
There are a lot of astronomical objects out there to study but binary objects seem to get more attention. Why is this? What makes binary objects (stars, Kuiper Belt Objects, black holes,... more
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05/10/19

Which of the following is the best example of Newton's second law?
Which of the following is the best example of Newton's second law?A. A rolling ball comes to a stop because the forces of friction and gravity are acting upon it.B. The acceleration of a skydiver... more
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05/10/19

How to get rid of mosquitoes in a small lake?
I own a small lake. Give or take it is about 50 meters wide and 100 meters long (or 160 feet wide, 320 feet long), with a max depth of around 2 meters / 6.5 feet. One third of the lake is... more
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05/09/19

If it rains harder, does it mean the rain's duration will be shorter?
If it rains real hard, is there a chance the rain's duration will be shorter? I think the if the rain in the clouds disperses with such force the rain will be over faster than if it was just a... more
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05/09/19

Long term effect on rocks of high pressure and temperature?
The mean surface temperature of Venus is about 460 C and the pressure is about 92 atmospheres. Assuming this situation (or similar) has prevailed for millions of years what changes (if any) would... more
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05/09/19

What is the probability that a star of a given spectral type will have planets?
There is a lot of new data from the various extrasolar planet projects including NASA's Kepler mission on extra-solar planets. Based on our current data what is the probability that a star of each... more
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05/09/19

How distorted does the Andromeda Galaxy appear to us due to the speed of light?
The Andromeda Galaxy appears to us at an angle to the galactic disk, i.e. we are not in the Andromeda Galaxy disc's plane, nor are we near the direction that the galaxy's pole points. Therefore,... more
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05/08/19

How far away is the sun?
how far is the sun from earth
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05/06/19

elements vs. compound
Pure substance are either elements or compounds?
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05/06/19

What determines a mineral's hardness?
Mohs Hardness Scale is basically a measurement of the hardness of a material, or more specific, a rock or mineral. But I have never been able to figure out why some minerals are harder than others.
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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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05/03/19

Why are most minerals so rare?
There are 4,660 known minerals, so why are most of them so rare? Is it to do with the structure of minerals?
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04/28/19

How can the mechanical advantage of an inclined plane, or ramp, be increased?

How can the mechanical advantage of an inclined plane, or ramp, be increased? A. by making the ramp shorter B. by making the ramp steeper C. by making the ramp longer D. all of these
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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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04/23/19

Science answer needed ASAP

Explain three ways a race car could increase its acceleration.
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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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04/04/19

How significant is a planet's density to the formation of life?
I'm doing some writing set on a fictional earthlike planet that for reasons needs to be substantially larger than Earth but can't have substantially higher gravity. I've been able to compromise... more
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