Question

Mercury has no atmosphere and Venus as atmosphere containing high amount of carbon dioxide which can retain the heat is this statement true Or false

Answer 1

Answer:

false...

Explanation:

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Answer 2

Answer:

Atmospheric components

Explanation:

Mercury is the smallest and least massive of the eight planets. Its low surface gravity makes holding on to an atmosphere in the best of circumstances a challenge.

But Mercury isn't ideally located for an atmosphere. Orbiting only a few million miles from the sun, the rocky planet is constantly bombarded by solar weather. The fast-moving winds blowing off the star constantly bombard Mercury, crashing charged particles into the planet's surface. Both the particles themselves and the heat they produce kick material up from the outer layer of the planet, sending it flying into the air. The heaviest atoms drift back to the surface, while the lightest are affected by gravity and by pressure from solar photons. The result is a tenuous atmosphere known as an exosphere.

In the past, scientists had to rely on brief glimpses captured by NASA's Mariner 10 spacecraft and Earth-based instruments studied the world's features as it crossed in front of the sun. Once NASA's MErcury Surface Space ENvironment, GEochemistry, and Ranging (MESSENGER) mission entered orbit around the planet, however, it could provide a more comprehensive look that helped clear up incorrect estimates made by earlier snapshots.

"Unfortunately in the entire mission we saw no oxygen in the Mercury exosphere, in contrast with what Mariner 10 reported," Rosemary Killen, XXX, told Space.com by email. Estimates based on Mariner's observations suggested that oxygen made up 42 percent of the tiny planet's atmosphere.

"We think they gave a generous upper limit," Killen said.

The atmosphere is filled instead with sodium, magnesium, and calcium, which are spread across the planet. Traces of hydrogen, helium, and potassium were also detected. Before the newest spacecraft arrived, scientists thought that solar radiation carried material kicked up on the sun-lit side by solar wind and radiation over to the night side, a process known as ion sputtering. According to MESSENGER co-investigator William McClintock, a senior scientist at the University of Colorado, Boulder, MESSENGER's observations reveal a variety of interactions affecting the movement of the atoms.

"They show that distinctly different source and loss processes control the populations of the major constituents," McClintock said in a statement

The main factor instead appears to be photon-stimulated desorption (PSD), a where photons release sodium.

According to Killen's research, sodium, calcium, and magnesium are each released by different processes and more likely to collide with the planet's surface than with each other.

The planet's weak magnetic field helps to funnel the material from the day to night side, but is not strong enough to explain the distributions observed. While Earth's magnetic field shields the planet from many of the sun's charged particles, the field surrounding Mercury is too weak.

"We had previously observed neutral sodium from ground observations, but up close we've discovered that charged sodium particles are concentrated near Mercury's polar regions where they are likely liberated by solar wind ion sputtering, effectively knocking sodium atoms off Mercury's surface," Thomas Zurbuchen of the University of Michigan said in a statement. Zurbuchen is the project leader for MESSENGER's Fast Imaging Plasma Spectrometer instrument, which made the first global measurements of Mercury's exosphere and magnetosphere.

"Our results tell us that Mercury's weak magnetosphere provides very little protection of the planet from the solar wind," Zurbuchen said.

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