space combo question. quite interesting by the way?

Question

what makes the astronaut come down to the ground when jumping on the moon? remember that there is no gravity.

why is that the "voyager" hasn´t crash yet?. it has been there for quite a long time.

what is the matter that makes the comets go without stopping?

what makes the sun burn without oxigen?
thanks for your time. greetings from México ! love to everyone!

Answer 1

Gravity makes the astronaut come back down when jumping on the Moon. The Moon has gravity. You may have noticed oceanic tides on Earth. Those are caused mainly by the Moon's gravity. It is utterly wrong to suggest there is no gravity on the Moon.

Voyager hasn't crashed yet because there is nothing to crash into. It's drifting in deep space.

All objects in motion tend to remain in motion, unless acted upon by an external force. That's Newton's first law.

The Sun is not burning with chemical reactions (like ordinary fire). It is burning with nuclear reactions, which transmute hydrogen into helium, destroying a small amount of mass, and creating energy, according to Einstein's mass-energy relation: E=m*c^2.

Answer 2

There is gravity on the moon, since the moon has mass. The gravity is roughly one sixth of the gravity on earth. If the moon had no gravity, anything jumping would fly off into space. Everything in the universe generates its own gravity, but the object has to be very large before the gravity can be measured.

Voyager is traveling through space and 99.99999% of space is totally empty. Voyager has nothing to impact.

Comets might resemble rockets, but they are not. What makes a comet "go" is gravity. It is pulled twoards the sun along its orbit. The heat of the sun melts the ice in the comet and it leaves a long trail behind the comet as it travels past the sun.

Things on earth burn according to a chemical reaction which combines carbon with oxygen to form carbon dioxide. On the sun, hydrogen atoms are fused together to form helium atoms. This is a nucleur process and generates far more energy than a chemical process.Entirely new atoms are being created on the sun, not just new molecules made out of old atoms like they are on earth. Fusion on the sun does not happen on earth, but if it could be done artificially, it would generate enormous amounts of energy.

Answer 3

There is gravity on the moon. It's about 1/5 as strong as it is here (because the moon is smaller and made of lighter stuff), An astronaut jumping on the moon will go higher, and fall back more slowly due to the weaker gravity.

Voyager is on a path out of the solar system into interstellar space. It is not expected to return.

Comets travel around the sun just like the earth, except they have a long elliptical path. They speed up moving toward the sun because of it's gravity, and slow down when they get far away, then they head back and do it again. That goes on indefinately unless they run into something.

The sun burns by nuclear fusion, like most stars. Atoms combine due to the powerful gravity crushing them together. A certain amount of energy is released once they "fuse", because less is needed once they combine compared to when they were two different atoms. It is a thermonuclear reaction, and doesn't need oxygen to burn.

Good questions!

Answer 4

there is an aceleration due to gravity in the moon which is about 6.6m/s^2 that is why astornaut come down to the ground

i think NASA should have the answer to the reason why voyager has not crash yet

the comet goes without stopping because there are no opposing forces like air resistance and friction in space

the sun burns through a reacton called nuclear fusion where two light atom fuse to form one at great heat and there is always and an enormous release of energy

Answer 5

1. The moon has gravity - about 1/6th as powerful as Earth's.

2. Voyager hasn't crashed because there's nothing (yet) to crash into.

3. Comets (generally) are in orbit. They'll go until they hit something.

4. The sun isn't really burning chemically - it's the fusion process that's happening. It's taking 4 atoms of hydrogen, and crushing them into 1 atom of helium, trillions of times per second.

Answer 6

moon has gravity whic is less than the earth
comets are nothing but the bodies which fail 2 become a star
As many other bodies,they do orbit because there is cos component acting perpendicular 2 the sin component
These 2 components are gravity and centrifugal force.
Assume that ther is no gravity then the comet would be thrown out of its orbit
The gravitational force pulls the object while the centrifugal forceholds and contiinues to push it in opposite direction

Answer 7

The gravity is 1/6 th that of earth. the moon has gravity.
Comets can go millions of years as long as they don't come too closet to another body.