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gravity

How did planets form in our solar system?

Planets form from particles in a disk of gas and dust, colliding and sticking together as they orbit the star. The planets nearest to the star tend to be rockier because the star’s wind blows away their gases and because they are made of heavier materials attracted by the star’s gravity.

Gravity

What force holds the sun together?

gravitational attraction

Why doesn’t the Sun’s gravity pull us in?

The earth is literally falling towards the sun under its immense gravity. So why don’t we hit the sun and burn up? Fortunately for us, the earth has a lot of sideways momentum. Because of this sideways momentum, the earth is continually falling towards the sun and missing it.

Why Earth doesn’t fall on its own?

Right now, the reason Earth is stable against gravitational collapse is because the forces between the atoms that make it up — specifically, between the electrons in neighboring atoms — is large enough to resist the cumulative force of gravity provided by the entire mass of the Earth.

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Why is gravity the strongest force?

Because the strong nuclear force is the strongest at short distances, it dominates over the other forces and the two protons become bound, forming a helium nucleus (typically a neutron is also needed to keep the helium nucleus stable). However, on astronomical scales, gravity does dominate over the other forces.

Why don’t we fall into the center of the Earth?

The reason that objects don’t fall to the center of the earth is that the force of gravity is balanced by the “normal force.” Basically, this force arises because the forces between molecules in the ground are strong enough that molecular bonds aren’t broken when we step on them.

Can you fall off the moon?

Although you can jump very high on the moon, you’ll be happy to know that there’s no need to worry about jumping all the way off into space. In fact, you’d need to be going very fast – more than 2 kilometres per second – to escape from the moon’s surface.

What would happen if the Earth stopped rotating?

At the Equator, the earth’s rotational motion is at its fastest, about a thousand miles an hour. If that motion suddenly stopped, the momentum would send things flying eastward. Moving rocks and oceans would trigger earthquakes and tsunamis. The still-moving atmosphere would scour landscapes.

Why Earth looks blue from space?

Water blocks the radiation of white light (sunlight). In reality, the sunlight looks white from a mixture of lights of many different colors. As illumination enters the water, the water consumes white light and reflects just blue light, lights of all colors. The earth from space, thus, looks blue.

What makes the Earth capable of supporting life?

Part of Hall of Planet Earth. What makes the Earth habitable? It is the right distance from the Sun, it is protected from harmful solar radiation by its magnetic field, it is kept warm by an insulating atmosphere, and it has the right chemical ingredients for life, including water and carbon.

How does Earth look from the space?

From space, Earth looks like a blue marble with white swirls. Some parts are brown, yellow, green and white. The blue part is water. Mapmakers use the line to divide Earth into two halves.

Why is it dark in space when the sun is in space?

The daytime sky is blue because light from the nearby Sun hits molecules in the Earth’s atmosphere and scatters off in all directions. At night, when that part of Earth is facing away from the Sun, space looks black because there is no nearby bright source of light, like the Sun, to be scattered.

Does the sun shine in space?

It does shine in outer space. If you look at it without proper eye protection, like that fancy gold visor, you go blind (or at least hurt your eyes). And even with a fancy visor, you will hurt your eyes. However, there’s no atmosphere in space, so sunlight doesn’t scatter.

Is the sun black?

As with all matter, the sun emits a “black body spectrum” that is defined by its surface temperature. A black body spectrum is the continuum of radiation at many different wavelengths that is emitted by any body with a temperature above absolute zero. So one might say that the sun is blue-green!

white

Blue stars

What if the sun was a different color?

If the sun was a different color then it would be either hotter or colder. Either one would be bad. A pretty small difference in the output of the sun would have big effects on our planet, and a change big enough to change its color is not small.

What would happen if the sun was red?

Even if the Earth were to survive being consumed, its new proximity to the the intense heat of this red sun would scorch our planet and make it completely impossible for life to survive. However, astronomers have noted that as the sun expands, the orbit of the planet’s is likely to change as well.

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What if our sun was a black hole?

If the Sun were somehow compressed enough to become a black hole, it would be less than 6 kilometers (well under 4 miles) across. It would exert no more gravitational force on Earth or the other planets in the solar system than it does now.

What color would the sun be if it was hotter?

Hotter stars, like Rigel, can get above 10000 Kelvin, and they look blue. Our own Sun has a temperature of almost 5800 Kelvin, and when viewed outside of our atmosphere, appears white. in colour.

Why is the sun so red today 2020?

It is orange-red because the sunlight reaching the dense smoke has already been reddened by less dense smoke. | Jim Hatcher in San Diego, California, captured this very red sun on September 7, 2020. The red color was caused by smoke in the air due to wildfires in the West this week.

What is the hottest color?

No matter how high a temperature rises, blue-white is the hottest color we are able to perceive.

What is the hottest star in the universe?

Only a few of them are visible to the naked eye, as most of this energetic radiation is ultraviolet, not visible. The Wolf-Rayet star WR 102 is the hottest star known, at 210,000 K.

What is the rarest star type?

Stars of this type are very rare, but because they are very bright, they can be seen at great distances and four of the 90 brightest stars as seen from Earth are O type. Due to their high mass, O-type stars end their lives rather quickly in violent supernova explosions, resulting in black holes or neutron stars.

UY Scuti

2021-05-14