Choose the correct option.
1. The sun has enough hydrogen left to last for approximately another five billion years. When [all the hydrogen/all hydrogen] has been burned, the sun will continue for about 130 million more years, burning helium.
2. As the sun burns helium, it will expand to the point that it will one by one engulf [each planet/each of the planets] closest to it. This may also include the Earth.
3. [All of planets/All the planets] in the solar system receive light from the sun. [Every/ Each] planet receives [a little/a few] less light the further it is from the sun. Light from the sun takes just [a little/a few minutes] to reach Mercury and over four hours to reach Neptune.
1. The sun has enough hydrogen left to last for approximately another five billion years. When [all the hydrogen/all hydrogen] has been burned, the sun will continue for about 130 million more years, burning helium.
2. As the sun burns helium, it will expand to the point that it will one by one engulf [each planet/each of the planets] closest to it. This may also include the Earth.
3. [All of planets/All the planets] in the solar system receive light from the sun. [Every/ Each] planet receives [a little/a few] less light the further it is from the sun. Light from the sun takes just [a little/a few minutes] to reach Mercury and over four hours to reach Neptune.
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1. The sun has enough hydrogen left to last for approximately another five billion years. When all the hydrogen has been burned, the sun will continue for about 130 million more years, burning helium.
2. As the sun burns helium, it will expand to the point that it will one by one engulf each of the planets closest to it. This may also include the Earth.
3. All the planets in the solar system receive light from the sun. Each planet receives a little less light the further it is from the sun. Light from the sun takes just a few minutes to reach Mercury and over four hours to reach Neptune.