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# Jagat Raya

The theory of relativity explains that the time and position of an event is relative to the frame of reference of an observer. This prezi simplifies the theory of relativity using beautiful visuals.
by

## Ilham Maulana Shiddiq

on 27 September 2012

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#### Transcript of Jagat Raya

Apa itu Jagat Raya ??? Teori Jagat Raya Mengembang

1. Georges-Henri Lemaitre (1927)
Menyatakan bahwa Jagat Raya tidak statis melainkan terus berkembang

2. Edwin Hubble (1929)
Menurut hasil penelitian dan pengamatannya, ditemukan bahwa galaksi-galaksi bergerak saling menjauhi. Hal ini berarti jagat raya mengembang menjadi lebih luas. i f r g o e g a >>GEOGRAFI<<

Jagat Raya & Tata Surya Teori yang menceritakan atau menjalaskan tentang terbentuknya jagat raya

teori jagat raya mengembang
teori BIG BANG
bagaimana jagat raya terbentuk ??? so time is an independent dimension, and with the other 3 spatial dimensions, they make up spacetime, the 4-dimensional world we live in. and the only thing that remains the same for every observer in the universe is the speed of light Light travels 300000 kilometres/ 186000 miles in only 1 second. Nothing can move faster. physicists discovered cosmological redshift of light. (which is an optical Doppler-effect.) they realized that stars out of our galaxy all suffer redshift, therefore they get further and further from us. light also travels in time. so if we look at the stars, we can only see the past. which states that at the very beginning, the whole universe was a single point, with extreme density and temperature, then it started to expand rapidly (like an explosion), and the expansion is still going on for at least 13 billion years. so they could model the
Big Bang theory this was the state of singularity, where the number of dimensions are infinite. There was no space and no time. with Einstein's theory,
scientists also discovered
black holes the very heavy radio stars, whose gravitational field is so strong that even light can't escape from them. that's why they are 'invisible' The theory of general relativity predicts that a sufficiently compact mass will deform spacetime to form a black hole. but what is relativity? imagine that you're in an elevator with your friend what you see is that the world around you is moving but from an other point of view, you're the ones who actually move Following this logic we can easily admit that everything is relative. except the speed of light. The speed of light is a constant. Light consists of photons, the particles whose mass is 0. this is something that never changes. Nothing can reach the speed of light that is heavier than photons. Therefore the only things which can exceed the speed of light are things with negative mass. interesting consequences DO YOU NOW SEE THE LIGHT? imagine your friend now flying with his spaceship and yourself watching him with your binoculars exactly when he's half-way between two twin stars, suddenly the stars explode in exactly the same time as you know, the light beams from both exploding stars travel with the same speed, and you see that they reach you at exactly the same time but what he sees from the inside, is quite different. as he travels towards the 2nd star, he actually reaches the beam from the 2nd star first. 1st 2nd
From different reference frames, there can never be agreement on the simultaneity of events. so he will think that the 2nd star exploded first. who's right? Einstein tells us that both are correct, within their own frame of reference. This is a fundamental result of special relativity: so these are the miraculous rules of our universe we have all experienced the Doppler-effect: it's the phenomenon when an ambulance passes by you with its sirens turned on. The sound you hear when it approaches is different from the one when it departs. Jagat raya adalah alam semesta yang sangat luas (tidak terukur) atau bahkan tidak dapat diketahui luasnya.
ada empat pandangan manusia tentang Jagat Raya
yaitu :
Antroposentris
Geosentris
Heliosentris
Galaktosentris Pandangan-pandangan manusia mengenai Jagat Raya

Pandangan Antrosentris
Pandangan Geosentris
Pandangan Heliosentris
Pandangan Galaktosentris

Pandangan Heliosentris

Dalam bahasa Yunani, Helios = Matahari
Menyatakan bahwa pusat Jagat Raya adalah Matahari, pandangan ini meruntuhkan pandangan sebelumnya tentang Geosentris, di perkuat dengan bukti-bukti fisik seperti pengamatan luar angkasa Teori Ledakan Besar (Big Bang)

Jika dikaitkan dengan teori mengembang, dahulu kala galaksi-galaksi pernah saling berdekatan. Teori ini beranggapan bahwa dahulu, galaksi dalam jagat raya berasal dari satu masa tunggal super besar, dan hanya suhu dan energi besarlah yang dapat meledakan masa tunggal tersebut.

Kemudian serpihan-serpihan hasil ledakan tadi menjadi awal terbentuknya jagat raya. Teori ini didukung oleh Stephen Hawking, seorang ahli fisika teoritis