<span>It could be a supernova.
The Crab Nebula is the remnants of a supernova explosion which was
observed in the year 1054. The star that exploded was 6000 light years
away and it was still a spectacular sight even from that distance.So its A.Let me know if I helped. Give me brainliest and stars. :) </span>
The correct answer is The star must be very large.
The visibility of a star totally depends on its brightness and luminosity. The star can be easily seen because it is very large in size. The light emitted from the star is visible only because the size of the star is very large as compared to that of other stars present in sky. For example: if you compare a headlight of a car and flashlight of the mobile phone which are kept 10 feet away from the observer. The headlight of car is easily visible as compared to that of flashlight because is it bigger in size and hence its brightness and luminosity will be more as compared to that of flashlight.
Plants (biosphere) draw water (hydrosphere) and nutrients from the soil (geosphere) and release water vapor into the atmosphere. Humans (biosphere) use farm machinery (manufactured from geosphere materials) to plow the fields, and the atmosphere brings precipitation (hydrosphere) to water the plants.
The half of the Moon that points toward the Sun looks bright because it is lit by sunlight. The Moon appears to change shape because we see different amounts of the lit part as the Moon orbits Earth. ... As it moves around Earth, more and more of the lit side comes into view.