scholarly journals Spaceflight from Super-Earths is difficult

2018 ◽  
Vol 18 (05) ◽  
pp. 393-395
Author(s):  
Michael Hippke
Keyword(s):  
Exponential Function ◽  
Space Flight ◽  
Surface Gravity ◽  
Planetary Surface ◽  
Extraterrestrial Intelligence ◽  
Fuel Mass ◽  
The Earth ◽  
Nuclear Propulsion ◽  
Space Colonization

AbstractMany rocky exoplanets are heavier and larger than the Earth and have higher surface gravity. This makes space-flight on these worlds very challenging because the required fuel mass for a given payload is an exponential function of planetary surface gravity, exp(g0). We find that chemical rockets still allow for escape velocities on Super-Earths up to 10× Earth mass. More massive rocky worlds, if they exist, would require other means to leave the planet, such as nuclear propulsion. This is relevant for space colonization and the search for extraterrestrial intelligence.

scholarly journals Revisiting the correlation between stellar activity and planetary surface gravity

2014 ◽  
Vol 572 ◽  
pp. A51 ◽  
Author(s):  
P. Figueira ◽  
M. Oshagh ◽  
V. Zh. Adibekyan ◽  
N. C. Santos
Keyword(s):  
Surface Gravity ◽  
Planetary Surface ◽  
Stellar Activity

The deep interior of Venus, Mars, and the Earth: A brief review and the need for planetary surface-based measurements

2011 ◽  
Vol 59 (10) ◽  
pp. 1048-1061 ◽  
Author(s):  
Antoine Mocquet ◽  
Pascal Rosenblatt ◽  
Véronique Dehant ◽  
Olivier Verhoeven
Keyword(s):  
Planetary Surface ◽  
The Earth ◽  
Deep Interior

Design of the Scheme Flight Trajectory Command for the Tactical Missile

2011 ◽  
Vol 480-481 ◽  
pp. 1426-1431
Author(s):  
Yong Tao Zhao ◽  
Yun An Hu
Keyword(s):  
Exponential Function ◽  
Solution Method ◽  
Great Circle ◽  
Spherical Triangle ◽  
Flight Trajectory ◽  
The Earth ◽  
Lateral Plane ◽  
Heading Angle ◽  
Simulation Results

For the case of the scheme trajectory command design for the tactical missile, the longitudinal and lateral commands and the compound controller of the attitude and height were designed. In the launch segment, four kinds of heading angle commands were presented adopting the arc method and reduction law. In the variable height flight segment, two kinds of height commands were gained by using the parabolic and exponential function. Considering the earth curvature, the formula of the great circle course and distance was gotten applying spherical triangle solution method, and the flight command along the route dot in the lateral plane was obtained. The simulation results show that the designed scheme trajectory commands are feasible and effectively.

scholarly journals Where Are They? Implications of Ancient and Future Migrations

1985 ◽  
Vol 112 ◽  
pp. 465-475
Author(s):  
Eric M. Jones
Keyword(s):  
New York ◽  
Hudson River ◽  
Radical Change ◽  
The Earth ◽  
The People ◽  
The World ◽  
Space Colonization ◽  
New Yorkers

Some of my more strident space-enthusiast friends wear T-shirts that say, “The meek shall inherit the Earth…the rest of us are going to the stars!” That may strike some as being overly optimistic at best, but I believe there is a grain of truth to it. Whenever I talk about space colonization or one-way voyages to the stars someone usually asks, “Who would want to go?” Usually someone else will the chime in, “I'll go!” Not only do people come in various sizes and shapes and colors, they look at the world in many different ways. I grew up in the suburbs of New York and knew people who had literally never been west of the Hudson River and had no intention of ever going. New York was comfortable. There is nothing wrong with that attitude. It is just that for many people such a life is not right for them. I went west as soon as I had the chance. I do not regret having left and am much more comfortable where I am now. As I have gotten older, I have found myself settling in and, although I like to travel, I am beginning to understand how those sedentary New Yorkers felt. The only difference is that I settled down a little later in life and in a different place from where I started. But some people never lose that need for adventure, that wanderlust, that need for a radical change, and new places. These are the people who will blaze the trail to the stars.

From Russian Icaria to Russian Cosmism

2021 ◽  
Vol 64 ◽  
pp. 361-368
Author(s):  
Fedor I. Girenok
Keyword(s):  
Space Flight ◽  
Human Being ◽  
Human Beings ◽  
The Earth ◽  
The World ◽  
Global Problems ◽  
History Of ◽  
Definition Of ◽  
The Universe

In the article the author analyzes the phenomenon of Russian cosmism and shows its difference from other possible varieties of cosmism. The author understands Russian cosmism as the idea of extending the definition of the universe by the human beings. A human being doesn’t simply have his place in history, on the Earth and in space, but also broadens it by means of his material and spiritual actions. The idea of the world broadening was popular among Russian naturalists in the 19th and the 20th centuries. The most prominent figures among the Russian cosmism followers were N.F. Fedorov and K. E. Tsiolkovsky. The author distinguishes three directions in the history of Russian cosmism – religious, natural-scientific and artistic-poetical. According to the author, only after Gagarin’s space flight the idea of Russian Icaria transferred itself into Russian cosmism. The article studies the sources of Russian cosmism and explains the meaning of anthropocosmism. The author arrives at the conclusion that Russian cosmism offers its own approach to solving modern global problems that differs from the ideas in the reports to the Roman club.

An estimate of the dose absorbed by a small shield in space flight close to the earth

Atomic Energy ◽  
1995 ◽  
Vol 78 (5) ◽  
pp. 329-332 ◽  
Author(s):  
V. V. Konyukov ◽  
V. I. Krainyukov ◽  
A. I. Trufanov
Keyword(s):  
Space Flight ◽  
The Earth

Some Reflections on Survey Disciplines in the Context of the Present Development and Requirements of Society

1976 ◽  
Vol 30 (1) ◽  
pp. 3-10
Author(s):  
T. J. Blachut
Keyword(s):  
Information System ◽  
Exponential Function ◽  
Professional Community ◽  
World Population ◽  
Geometric Features ◽  
Ambient Conditions ◽  
Dynamic Information ◽  
Planning Strategy ◽  
The Earth ◽  
New Situation

Following an exponential function, not only is world population rapidly increasing but so is our knowledge in all fields. This also holds true in the surveying disciplines. Owing to the introduction of photo grammetry, the initial scope of surveying disciplines has been significantly widened and today includes the traditional field of interest as well as the mapping of celestral bodies and precise measurements of a variety of objects and phenomena not connected with the shape and the size of the earth or its surface. This widening of the traditional field of activity occurred, however, before the primary objectives and the responsibility of the surveying disciplines were fulfilled. Only a portion of the earth’s surface has been surveyed and mapped, but what is urgently needed today is a much more detailed and dynamic information system revealing not only the geometric features of the earth, but also its resources and rapidly changing ambient conditions. To meet this requirement, it is important that the scientific and professional community realizes the new situation and takes a more active part, or perhaps even assumes direct leadership, in an effort toward planning strategy for the survival of mankind.

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