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The lake does seem to contain plenty of water. But for the water to be liquid at such cold temperatures, it also must be extremely salty. Some bacteria on Earth seem to thrive even in extreme conditions. These might have ended up finding the cold, salty water quite comfortable, she says. Getting to Mars would be a relatively quick journey. A spacecraft could reach there in four to 11 months.

Those plumes would make sampling the oceans relatively simple: A spacecraft could just catch some spray during a flyby. But the fact that water can get out also means that invading microbes can get in. Scientists have already probed similar under-ice lakes on Earth, such as Lake Whillans in Antarctica.

In , a U. Each thimbleful of water they brought up contained roughly , living cells. In all, this water hosted 3, microbial species or groups of species.

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“Mars: The Living Planet” by Barry E

Drilling on Mars would be even more technically challenging. It also could face opposition from the scientific community. This has suggested these variations might point to microbial life under the surface.

He also was part of the team that just discovered the Martian lake. A scientist who works in this field is known as an astrobiologist. People who work in this field are known as astrophysicists.


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These dwell nearly everywhere on Earth, from the bottom of the sea to inside other living organisms such as plants and animals. Apatite, for example, forms six-sided crystals. The mineral crystals that make up rock are usually too small to be seen with the unaided eye. Examples include tropical reefs, rainforests, alpine meadows and polar tundra. The term can also be applied to elements that make up some an artificial environment, such as a company, classroom or the internet. Enceladus is bright white and covered with a thick shell of ice. Deep beneath that ice sits what appears to be a global ocean of salty liquid water.

Enceladus is a round sphere, kilometers miles across. It is a little less than one-third the width of Earth's moon. Europa, 1, miles across, has a network of dark lines on a bright, icy surface. Humans may be a temporary host for food-poisoning germs or other infective agents.

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Ice sheets currently cover most of Antarctica. An ice sheet also blankets most of Greenland. During the last glaciation, ice sheets also covered much of North America and Europe. A gas giant, its low density indicates that this planet is composed of light elements, such as hydrogen and helium. This planet also releases more heat than it receives from the sun as gravity compresses its mass and slowly shrinks the planet.

Like Earth, it has seasons and moisture. A living thing that is too small to see with the unaided eye, including bacteria, some fungi and many other organisms such as amoebas. Most consist of a single cell. Created in , this U. It also has sent research craft to study planets and other celestial objects in our solar system. On the internet. A term for what can be found or accessed on the internet.

It may be in air, soil or water.


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It gets its name from the fact that it tends to be long and relatively thin, shaped like a large feather. When viruses make new copies of themselves — essentially reproducing — this process is called replication. Replication depends upon repeating every step of a test, one by one. If a repeated experiment generates the same result as in earlier trials, scientists view this as verifying that the initial result is reliable. If results differ, the initial findings may fall into doubt. Generally, a scientific finding is not fully accepted as being real or true without replication.

One of the four gas giants, this planet takes It has at least 53 known moons and 9 more candidates awaiting confirmation. But what most distinguishes this planet is the broad and flat plane of seven rings that orbit it. For instance, clocks attempt to match the official standard benchmark of time — the second, as calculated by the official atomic clock.

Examples include tropical reefs, rainforests, alpine meadows and polar tundra. The term can also be applied to elements that make up some an artificial environment, such as a company, classroom or the internet. Enceladus is bright white and covered with a thick shell of ice. Deep beneath that ice sits what appears to be a global ocean of salty liquid water.

Enceladus is a round sphere, kilometers miles across.

It is a little less than one-third the width of Earth's moon. Europa, 1, miles across, has a network of dark lines on a bright, icy surface. Humans may be a temporary host for food-poisoning germs or other infective agents. Ice sheets currently cover most of Antarctica. An ice sheet also blankets most of Greenland. During the last glaciation, ice sheets also covered much of North America and Europe. A gas giant, its low density indicates that this planet is composed of light elements, such as hydrogen and helium.

This planet also releases more heat than it receives from the sun as gravity compresses its mass and slowly shrinks the planet. Like Earth, it has seasons and moisture. A living thing that is too small to see with the unaided eye, including bacteria, some fungi and many other organisms such as amoebas. Most consist of a single cell. Created in , this U.

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It also has sent research craft to study planets and other celestial objects in our solar system. On the internet. A term for what can be found or accessed on the internet. It may be in air, soil or water. It gets its name from the fact that it tends to be long and relatively thin, shaped like a large feather. When viruses make new copies of themselves — essentially reproducing — this process is called replication.

Replication depends upon repeating every step of a test, one by one. If a repeated experiment generates the same result as in earlier trials, scientists view this as verifying that the initial result is reliable.

Finding living Martians just got a bit more believable

If results differ, the initial findings may fall into doubt. Generally, a scientific finding is not fully accepted as being real or true without replication. One of the four gas giants, this planet takes It has at least 53 known moons and 9 more candidates awaiting confirmation. But what most distinguishes this planet is the broad and flat plane of seven rings that orbit it.

For instance, clocks attempt to match the official standard benchmark of time — the second, as calculated by the official atomic clock. Similarly, scientists look to identify a chemical by matching its properties against a known standard for a particular chemical.