Please answer this question in the attachment. The one who will answer correctly will be marked as brainliest and wrong answers or spam will be reported.
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Answer:
Astronomers theorize that the faster expansion rate is due to a mysterious, dark force that is pulling galaxies apart. One explanation for dark energy is that it is a property of space. ... As a result, this form of energy would cause the universe to expand faster and faster.
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1 ANSWER =In the early 1990s, one thing was fairly certain about the expansion of the universe. It might have enough energy density to stop its expansion and recollapse, it might have so little energy density that it would never stop expanding, but gravity was certain to slow the expansion as time went on. Granted, the slowing had not been observed, but, theoretically, the universe had to slow. The universe is full of matter and the attractive force of gravity pulls all matter together. Then came 1998 and the Hubble Space Telescope (HST) observations of very distant supernovae that showed that, a long time ago, the universe was actually expanding more slowly than it is today. So the expansion of the universe has not been slowing due to gravity, as everyone thought, it has been accelerating. No one expected this, no one knew how to explain it. But something was causing it.
Eventually theorists came up with three sorts of explanations. Maybe it was a result of a long-discarded version of Einstein's theory of gravity, one that contained what was called a "cosmological constant." Maybe there was some strange kind of energy-fluid that filled space. Maybe there is something wrong with Einstein's theory of gravity and a new theory could include some kind of field that creates this cosmic acceleration. Theorists still don't know what the correct explanation is, but they have given the solution a name. It is called dark energy.
2 ANSWER=On Valentine’s Day 1990, as the Voyager 1 space probe pushed towards the outer edge of our solar system, its cameras looked back to where it had come from to snap a series of photographs. Taken at a distance of about four billion miles from Earth, the images form the first and only “family portrait” of six of the eight planets arrayed around their parent star. In one, the Earth appears as a pinprick of light just one 12th of a pixel in size, a “mote of dust suspended in a sunbeam”, as the astronomer Carl Sagan observed.
This image is still the furthest-away photograph ever taken of our “blue dot”, underscoring its beauty and fragility, imploring us to take care of the only place we know that harbours life: our home. It is infinitely precious — and yet, in the three decades since Voyager’s backward glance, we have learnt that our neighbourhood scatter of worlds is far from unique.
It was in the early 1990s that scientists started to discover planets orbiting stars other than our sun. Among the thousands of other solar systems we have catalogued since then, we have identified more than 4,000 “exoplanets” — in fact, it seems that just about every star in our galaxy has at least one planet. With approximately 200 billion stars in our galaxy, that makes 200 billion planets in our galaxy alone — at least. And our galaxy is just one among billions of galaxies.