Appendix A - Comparative Tables

Table 1. Energy comparisons.*

```Event               | Energy, J    | Energy, Relative
--------------------+--------------+-----------------------
Two 3,500-lb. cars  | 9.6 x 10^5   | 1
at 55 mph           |              |
|              |
Explosion of 1 U.S. | 4.2 x 10^9   | 4,271
ton of TNT          |              |
|              |
Explosion of a      | 8.4 x 10^16  | 87,500,000,000
20-megaton fusion   |              |
bomb                |              |
|              |
Total U.S. annual   | 1 x 1019     | 10,400,000,000,000
electric power      |              |
production, 1990    |              |
|              |
Energy released in  | ~ 9 x 10^21  | 9,375,000,000,000,000
last second of      |              |
10^13 kg fragment   |              |
of Shoemaker-Levy 9 |              |
|              |
Total energy        | 1.8 x 10^22  | 18,750,000,000,000,000
released by 1013-kg |              |
fragment of         |              |
Shoemaker-Levy 9    |              |
|              |
Total sunlight on   | 6.6 x 10^22  | 68,750,000,000,000,000
Jupiter for one day |              |
--------------------+--------------+-----------------------
*1 BTU = 252 (small) calories = 1,055 J = 2.93 x 10-4 kWh.
```

Table 2. Power comparisons.*

```Power Producer          | Power, MW   | Power, Relative
------------------------+-------------+------------------------
Hoover Dam.             | 1,345       | 1
|             |
Grand Coulee Dam, final | 9,700         7.2
plant.                  |             |
|             |
Annual average, sum of  | 320,000     | 238
all U.S. power plants.  |             |
|             |
Average, impact of      |~ 9 x 10^15  | 6,700,000,000,000t
1013-kg fragment of     |             |
Shoemaker-Levy 9,       |             |
final sec               |             |
|             |
Sun                     | 3.8 x 1020  | 280,000,000,000,000,000
---------------------------------------------------------------
*1 horsepower = 745.7 W = 7.457  x 10-4 MW.
```

Table 3. Size comparisons.*

```Object                 | Radius, km              |  Volume, km^3
-----------------------+-------------------------+--------------
Jupiter                | 71,350 (Equatorial)     |  1.4 x 10^15
| 67,310 (Polar)          |
|                         |
Earth                  | 6,378 (Equatorial)      |  1.1 x 10^12
| 6,357 (Polar)           |
|                         |
Comet Shoemaker-Levy 9 | 4.5 (Equivalent sphere) |  382
|                         |
Comet Halley           | 7.65 x 3.60 x 3.61      |  365
----------------------------------------------------------------
*1 mi. = 1.609 km
```

Table 4. Brightness comparisons.

```Object              |  Magnitude Vo | Relative Brightness
--------------------+---------------+--------------------
Largest fragment of |~ -10          | 1,000
Shoemaker-Levy 9    |               |
during last second  |               |
|               |
Jupiter             |  -2.5         | 1
|               |
Ganymede            |   4.6         | 1/692
|               |
Io                  |   5.0         | 1/1,000
|               |
Largest fragment of |   23.7        | 1/30,000,000,000
Shoemaker-Levy 9    |               |
as viewed today     |               |
--------------------+---------------+--------------------
```