Gravity
Lots of people think gravity just works, but this is not the case. Mass creates a dent in space-time which causes other masses to fall into these dents. OK, so just think that there is a rubber mat suspended from all four corners. Now, if we put a basket ball into the middle it would make a dent in the mat. If we put a tennis ball near it, it will sink in to the dent. Like the earth and the moon, this is what gravity is.
This article was written by Nicholas Cranefield, idea by Liam Scaife.
This article was written by Nicholas Cranefield, idea by Liam Scaife.
Raindrops
Raindrops are physically and mathematically impossible!
Turns out, it requires more energy to maintain a raindrop than the raindrop actually has. This breaks The Laws Of Thermodynamics!
See this video for more.
This article was written by Liam Scaife.
Turns out, it requires more energy to maintain a raindrop than the raindrop actually has. This breaks The Laws Of Thermodynamics!
See this video for more.
This article was written by Liam Scaife.
How big is the universe?
Nobody knows how big the universe is but it is not infinite because there would be infinite matter and the universe would collapse in on its self. But see this for the rough scale of stuff in the universe!
This article was written by Nicholas Cranefield, idea by Liam Scaife.
This article was written by Nicholas Cranefield, idea by Liam Scaife.
Can the Universe shrink?
You would assume that if the universe can grow than it can shrink, but is this true?
The universe has existed for 13.8 billion years, and it is expanding at 74.3 kilometers per second. So I am making a horrible estimate that the universe is about 3.2692948e+18 kilometers big! You can assume that if it where shrinking that it would shrink at the same speed as it is expanding, but this would mean that it would not be moving an inch. So it must be shrinking at 74.2 kilometers per hour. This means that we would never notice it (as 3.2692948e+18 - 46.6 = 3.2692948e+18), but that's only if we where at the center of the universe. So, to be honest, we really don't know, and we may never know.
This article was written by Liam Scaife, asked by Scott Klenner.
The universe has existed for 13.8 billion years, and it is expanding at 74.3 kilometers per second. So I am making a horrible estimate that the universe is about 3.2692948e+18 kilometers big! You can assume that if it where shrinking that it would shrink at the same speed as it is expanding, but this would mean that it would not be moving an inch. So it must be shrinking at 74.2 kilometers per hour. This means that we would never notice it (as 3.2692948e+18 - 46.6 = 3.2692948e+18), but that's only if we where at the center of the universe. So, to be honest, we really don't know, and we may never know.
This article was written by Liam Scaife, asked by Scott Klenner.
Doppler Effect
For you who don't know, the Doppler Effect is the impact on the frequency of a wave by movement in relation to the observer. The question is, can the Doppler Effect be related to the expansion of the universe?
The universe is expanding at (as we have seen in the post above) 74.3 kilometers per second. We have proof of this because of, wait for it... the Doppler Effect!
The distant stars are red because of the Doppler Effect, as the constant movement of the stars is stretching the wavelength of the light.
So, i agree that the Doppler Effect is evidence of the expansion of the universe.
Source: ENotes
This article was written by Liam Scaife, asked by Scott Klenner.
The universe is expanding at (as we have seen in the post above) 74.3 kilometers per second. We have proof of this because of, wait for it... the Doppler Effect!
The distant stars are red because of the Doppler Effect, as the constant movement of the stars is stretching the wavelength of the light.
So, i agree that the Doppler Effect is evidence of the expansion of the universe.
Source: ENotes
This article was written by Liam Scaife, asked by Scott Klenner.