Space exploration is expensive, and many claim that money is better spent fixing problems at home. It can also lead to technology that yields weapons. Some have even suggested that space exploration risks drawing the attention of dangerous aliens.Know More
Space exploration is not cheap, and developing first-of-a-kind spacecraft is too expensive for most nations to even consider. During the Apollo program, some questioned whether money spent on sending people to the moon would be better spent on education, fighting poverty and developing new medication. The space shuttle program had a total cost of $209 billion. Proponents of space travel counter that technology developed during these programs makes the costs worth spending.
Others argue that space exploration leads to the development of dangerous weapons. Ronald Reagan received a considerable amount of criticism for his "Star Wars" initiative of weaponizing satellites and other space technology. In recent years, however, no nations have expressed interest in these types of systems.
Steven Hawking famously claimed that humans should consider dangerous alien species before reaching out to extraterrestrial life. In his mind, it is reasonable to imagine an alien species that seeks out alien planets for resources. Space exploration would make the earth more visible and more likely to attract unwanted attention.Learn more about Space Travel
Some negative consequences of space exploration include the emission of ozone-depleting substances and the presence of man-made debris in the earth's orbit. In addition, astronauts may experience some negative physical effects of space exploration.Full Answer >
Positive attributes of space exploration include identifying potentially habitable planets, locating non-renewable resources and driving technological advancement; however, space exploration has negative attributes, such as exposure to radiation and vacuum, and a high cost of access. The continued exploration of space by humans demonstrates that the rewards outweigh the risks.Full Answer >
The mysterious "fireflies" that John Glenn saw during his first trip into space were caused by frozen condensation on the skin of his spacecraft. As the capsule moved from light into dark, the condensation froze into tiny snowflakes, and these ice crystals sparkled in the sun when dislodged.Full Answer >
The first rocket to go into space was created by a team of German scientists, led by Wernher von Braun. It was a V-2 rocket used by Germany in World War II. Von Braun and many important members of his team had surrendered to the United States.Full Answer >